Fit
“Will it fit me?”
Every dress has the designer's own size chart and a fit guide on 4 body sizes. Between sizes? Size up.
Portia and Scarlett PS27070 Strapless Lace Corset Mermaid Sweep Train Gown
Buy now, pay later.
Buy now, pay later
Choose your plan at checkout. Available in Canada and the USA.
Sezzle
Split it into interest-free payments
Pay the first payment today, the rest every two weeks. No interest.
Affirm
Monthly payments
Spread the cost over monthly instalments. Rates and terms depend on eligibility.
Select Sezzle or Affirm as your payment method at checkout.
Sold out in your size? Tap the crossed-out size to get notified.
We can usually order it from Portia and Scarlett for you. Message us and a stylist will send you the date.
Or message a stylist:
Standard: arrives in 7 to 12 days
Express: arrives in 4 to 6 days
Talk to a stylist
Real stylists answer your questions on fit, sizing and delivery.
Text us at +1 213-868-3131
Replies in about 10 minutes. Prefer email? hello@marlasfashions.com
Why shop at Marla's
What makes us different
4 worries we solve for every customer
Real stylists
“Who can I ask?”
Text or WhatsApp a real stylist 7 days a week. Replies in about 10 minutes.
Price match + $10 off
“Can I find it cheaper?”
Found it for less on a Canadian or US website? We'll match the price and take another $10 off, as long as your colour and size are available.
Shipping
“Will it arrive in time?”
Ships from LA, Chicago, New York & Toronto in our pink Marla's box. No duties. Free over $250. Standard 6–9 business days.
Not ready yet? Tap ♡ to save it to your wishlist. It's there whenever you're ready.
Description
About the Dress: Portia and Scarlett PS27070
Portia and Scarlett PS27070 is a long strapless mermaid gown built around a lace illusion corset bodice with visible boning channels and a smooth fitted skirt that sweeps into a dramatic train. The silhouette is structured, sleek, and unapologetically formal — this is a dress designed to command a room. PS27070 is available in Black, Blue, Pink, and Yellow, photographed in all four colorways so you can compare shades before ordering.
Fit & Silhouette
PS27070 follows a true mermaid silhouette: the skirt fits close through the hips and thighs, then flares out below the knee into a full sweep train. The strapless corset bodice is reinforced with internal boning that holds the shape and keeps the neckline in place all evening without shoulder straps. Ruching at the hip transition smooths the fit and flatters the natural waist-to-hip curve. This style is built to fit close, so measuring your bust, waist, and hips precisely before choosing a size is essential — refer to Portia and Scarlett's size chart and size to whichever measurement runs largest.
Fabric & Detail
The bodice is constructed from lace over a sheer illusion underlayer, with visible boning channels running through the corset structure. The skirt is a smooth stretch fabric — jersey or stretch satin depending on the colorway and supplier run — that moves with the body and holds the mermaid shape cleanly to the floor. The lace at the bodice adds texture and dimension without competing with the sleek skirt. At the back, a lace-up corset closure runs the full length of the bodice, allowing a meaningful range of size adjustment on the day of the event.
Key Features
- Strapless strapless neckline with lace illusion corset bodice
- Visible boning channels throughout the bodice for structure and support
- Ruching at the hip for a smooth, flattering fit through the waist
- True mermaid silhouette flaring below the knee into a sweep train
- Lace-up corset closure at the back for adjustable fit
- Sleeveless construction — no straps
- Available in Black, Blue, Pink, and Yellow
Style & Occasion
Portia and Scarlett PS27070 is a strong choice for prom, formal dances, galas, black-tie events, and evening affairs where a dramatic long gown is the right call. The strapless lace corset silhouette reads as polished and sleek rather than overly ornate, so it works equally well for school prom, a formal black-tie dinner, or a gala entrance. Black is the most dramatic and photography-ready option; Blue photographs cooler and more jewel-toned in real life; Pink reads warmer and softer in person than in composite shots; Yellow is a bold statement color that stands out strongly on a dance floor. Pair with strappy heeled sandals and a simple clutch — the dress does the work, so accessories can stay minimal. Portia and Scarlett PS27070 is inspected by the Marlas Fashions team before it ships, and every order arrives with full tracking.
Size & fit
- Fitted. Bust, waist and hips all matter. Go by your largest measurement.
- Between sizes? Text a stylist and we'll help you choose.
Shipping
- Arrives in 7–12 business days, or 4–6 with Express (+$35).
- Free shipping over $250 to Canada and the USA.
- Text updates as your order ships.
Full shipping details
Your Dress — Delivered in Days, Not Weeks.
We know timing matters — especially for prom, weddings, quinceañeras, and special events.
- Receive your dress within 7–12 business days, depending on designer availability.
- You’ll receive text updates as your order moves from processing to shipping.
- Once shipped, delivery typically takes 2–5 business days within North America.
Need it sooner?
We offer rush options where you can receive your dress within 4–6 business days. Text us at +1 416-536-2956 before ordering and we’ll confirm the fastest possible delivery date.
We are an authorized retailer of top designers, which means your dress ships brand new and directly from the designer or our showroom — never used, never rented.
Have an event date? Add it in your order notes so we can prioritize accordingly.
We proudly ship across Canada, the United States, and Internationally, with in-store pickup available at our Toronto showroom.
Returns
- Tell us within 5 days of delivery.
- 100% store credit, a one-time exchange, or a refund (30% restocking fee).
- Online purchases only; in-store purchases are final.
Full return policy
WE ACCEPT RETURNS!
For Online Purchases Only. All in-store purchases are FINAL.
We hope you LOVE your dress — but if you're not completely satisfied with your online purchase, you may request:
- 100% Store Credit (no expiration).
- A one-time exchange, OR
- A return with a 30% restocking fee, OR
You must notify us of a return within 5 days of delivery (including weekends and holidays — we are open 7 days a week).
We have no control and accept no responsibility for the sizing selected. Please carefully review the size chart before ordering. If you need assistance with sizing, we’re happy to help — text us at +1 416-536-2956.
ORDER CHANGES & CANCELLATIONS
Once your order is placed, you have 5 hours to request a change to the color, size, or style.
If an item becomes unavailable, we will offer alternatives or provide the option of a full refund for that item.
Please see our Returns & Exchanges page for full details.
-
Free standard shipping on orders over $250 to the US and Canada. Under $250, shipping is shown at checkout.
Shipping details -
US orders ship from our warehouses in Los Angeles, Chicago and New York. Canadian orders ship from Toronto. No duties to pay at the door.
Shipping details -
Exchange, store credit or refund. Dresses tagged Final sale can't be returned.
Return policy -
Found this dress cheaper? Send us the link and we'll match the price.
Ask a stylist
Why buy from Marlas
Authorized retailerEvery dress authentic, direct from the designer
Toronto flagship10,000 sq ft showroom, 100,000+ clients styled
15,700+ online ordersShipped to 59 countries
Real stylistsText, WhatsApp or chat. Replies in about 10 min
Choose options
Need help?
Frequently Asked Questions
Most mermaid prom gowns rely on sequins or heavy beading to make an impact. PS27070 takes a different approach: the drama comes entirely from structure and fit rather than surface embellishment. The lace illusion corset bodice has visible boning channels running through it, which gives the top a sculpted, architectural look that reads as sophisticated rather than flashy. The lace sits over a sheer underlayer, so you get texture and depth in the bodice without adding bulk or weight. The skirt is a smooth stretch fabric that stays close through the hips and thighs all the way to the knee, then fans out into a sweep train — a clean, uninterrupted silhouette from neckline to floor. That combination of a detailed lace top and a sleek bottom is not that common at the prom price point, and it photographs exceptionally well in both close-up and full-length shots.
The lace-up corset closure at the back is another practical differentiator. Unlike a zipper, it can be tightened or loosened by a few inches on the day of the event, which is useful if your measurements sit between standard sizes or if your dress arrives slightly loose or slightly snug. The ruching at the hip transition is subtle but structural — it smooths the curve from waist to hip and reduces the risk of pulling or gaping at the widest point. Together, these construction details make PS27070 a more forgiving fit than most strapless mermaid styles.
The color range is also broader than average. Black, Blue, Pink, and Yellow are all photographed in the composite image, so you can compare the actual shades rather than guessing from a swatch name. Each colorway reads distinctly in person — the Black is deep and matte, the Blue has a jewel-toned coolness, the Pink is warm and slightly dusty, and the Yellow is a full saturated statement shade. If you are choosing between PS27070 and another strapless mermaid, the deciding factors are usually the lace corset bodice (more structured and detailed than most), the adjustable lace-up back, and the cleaner skirt silhouette with no surface decoration below the waist.
PS27070 is built for fully formal occasions — the kind of event where a long, structured gown is expected or strongly appropriate. The most natural fits are prom, formal dances, galas, black-tie events, and formal evening affairs. The strapless lace corset silhouette is dramatic enough to read as event-worthy at any of those, and the sweep train adds length and movement that works well on ballroom floors and formal venues.
For prom specifically, this style is a strong choice for someone who wants to stand out through fit and structure rather than heavy embellishment. The lace corset bodice is distinctive without being over-the-top, and the mermaid silhouette photographs beautifully in group shots and individual portraits. Black is the most versatile choice if you are coordinating with a group in mixed colors; a solid fashion color like Blue, Pink, or Yellow works well if you want your dress to be immediately recognizable in photos.
For gala events and black-tie occasions, PS27070 works because it reads as polished and intentional rather than party-forward. The smooth skirt and structured bodice give it a more refined, editorial look than a heavily beaded or sequined gown. It is appropriate for charity galas, awards dinners, debutante events, formal performances, and similar occasions where the dress code calls for a long formal gown.
As a wedding guest, this dress suits evening receptions and black-tie celebrations best; for daytime or traditional ceremonies, a more covered style is usually the better choice. It is also not suited to casual or semi-formal events where a floor-length structured mermaid would be out of place.
If you are unsure whether the formality level matches your specific event, the Marlas Fashions concierge team is easy to reach — text or WhatsApp at +1 416-536-2956 or +1 213-868-3131, and they can help you decide whether PS27070 is the right call for your occasion.
The back of PS27070 has a full lace-up corset closure that runs the length of the bodice from the top edge down to where the skirt begins. It works the same way as a traditional corset: a ribbon or lace threads through a series of eyelets, and tightening or loosening the lace changes the circumference at the bust and waist. The adjustment range on a well-constructed corset back is typically two to three inches in each direction — so roughly four to six inches of total flexibility across the bodice. This is meaningful: if you are between standard sizes, you can often size to the larger measurement and take the lace-up closure in on the day of the event rather than committing to a rigid zipper size. If the dress arrives slightly looser than expected after ordering, the lace-up allows a tailor to adjust without touching the dress seams. The closure is at the back of the bodice, so it is not visible from the front — the lace corset detail visible from the front is the decorative lace illusion panel, not the functional closure.
Yes, PS27070 is a practical group option. Because it comes in four distinct colors — Black, Blue, Pink, and Yellow — a court or damas group can coordinate without wearing identical shades. A common approach is to put the honoree in one featured color (Black or a bold fashion shade) and assign the court members to the remaining colors, or to put the full group in the same color for a more uniform look. The dress style is identical across colorways, so the silhouette reads as a matched set in group photographs even when the colors differ. The mermaid silhouette and strapless corset bodice are consistent enough across body types to create a cohesive line when the group is standing together. For group orders, Marlas Fashions recommends contacting us early — group orders benefit from ordering all sizes together to ensure they come from the same production run and the colors are consistent across units.
Portia and Scarlett sizing generally runs close to standard US formal wear sizing, but mermaid gowns are cut to fit closely through the hip and thigh, which means the hip measurement is the most important number to get right. Measure your bust at the fullest point, your natural waist, and your hips at the fullest point, then compare all three to the Portia and Scarlett size chart. If your measurements land in different sizes across the three, size to the largest measurement — particularly the hips on a mermaid silhouette. The lace-up corset back provides some adjustment at the bust and waist, but the skirt itself is a fixed cut, so hips need to fit the size you order. If your measurements are borderline, contact the Marlas team before ordering and we can advise on which direction to go. Every PS27070 order is hand-inspected before shipping so the fit and finish arrive flawless. If you are between sizes on the PS27070, send our team your measurements before ordering and we will advise.
The boned lace corset bodice on PS27070 is designed to be worn without a bra. The internal boning creates structure and lift, and the corset lace-up closure at the back allows the bodice to be fitted precisely to your measurements, which is what holds everything in place. For most wearers, the boning and corset closure together provide adequate support without additional undergarments. If you prefer extra coverage or security, a low-back adhesive bra or fashion tape can be used under the lace bodice without showing. For the skirt, seamless underwear or a thin slip in a matching shade works best — the stretch fabric can show lines through heavier undergarments. Spanx or compression shorts in a color close to your skin tone are a common choice for comfort and smoothness under a fitted mermaid skirt. Every PS27070 order is hand-inspected before shipping so the fit and finish arrive flawless. If you are between sizes on the PS27070, send our team your measurements before ordering and we will advise.
PS27070 can be hemmed by any experienced formal wear tailor, though mermaid gowns with sweep trains require more care than a straight hem because the flare of the skirt needs to be preserved. A tailor will typically take the length from the top of the bodice or add an internal hem to the skirt without disrupting the mermaid flare. If you are petite, hemming is usually necessary — the sweep train is cut for a tall frame and will drag significantly on the floor for shorter wearers. For taller wearers, the sweep train may need no adjustment at all. Plan for alterations as part of your budget, particularly for hemming — formal mermaid gowns almost always require at least a hem adjustment. Order early enough to allow time for alterations before your event. Every PS27070 order is hand-inspected before shipping so the fit and finish arrive flawless. If you are between sizes on the PS27070, send our team your measurements before ordering and we will advise.
After wearing, hang PS27070 on a padded hanger rather than folding it — the lace bodice can crease if compressed for an extended period. For storage longer than a few weeks, a breathable garment bag (not plastic) keeps dust off without trapping moisture. If the dress needs cleaning after the event, take it to a dry cleaner experienced with formal gowns and lace fabrics — mention the lace corset bodice and the stretch skirt fabric so they can treat both components appropriately. For travel to the event, fold the skirt loosely with tissue paper inside the folds to minimize creasing, and keep the bodice as flat as possible. Most light creases in the skirt fabric will fall out if the dress is hung overnight before wearing. Avoid storing near direct heat or sunlight, which can affect both the lace and fashion colors like Pink and Yellow over time. Every PS27070 order is hand-inspected before shipping so the fit and finish arrive flawless. If you are between sizes on the PS27070, send our team your measurements before ordering and we will advise.