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Portia and Scarlett XO309 Strapless Sweetheart Pearl Fitted Gown
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Standard: arrives in 7 to 12 days
Express: arrives in 4 to 6 days
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Text us at 416-536-2956
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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.
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Ships from LA, Chicago, New York & Toronto in our pink Marla's box. No duties. Free over $250. Standard 6–9 business days.
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Style it with
Stick-on bra
Invisible support for strapless & backless
$20 CAD
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Double-sided tape
Keeps necklines in place all night
$20 CAD
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Garment bag
Our signature pink bag. Arrives clean and protected
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Description
About the Dress: Portia and Scarlett XO309
Portia and Scarlett XO309 is a strapless sweetheart fitted long gown built for prom and formal evenings. The bodice opens with a pronounced sweetheart neckline, and the silhouette stays close through the waist and hips before flaring gently at the hem with a sweep train. Scattered pearl embellishments run across the bodice and skirt, giving the gown its defining look. XO309 is available in Periwinkle, Pink, and Sage.
Fit & Silhouette
Portia and Scarlett XO309 is cut to fit close through the bust, waist, and hips. The skirt flares gradually below the knee and ends in a small sweep train. Diagonal ruching wraps across the bodice and around the hip, which helps define the waist and smooths the fit across different body shapes. The lace-up corset back allows you to fine-tune the fit at home — take it in or let it out to get the right level of support. Sizing runs standard; most customers order their usual size and use the corset lacing to dial in the final fit. If you are between sizes or have a longer torso, our team can help you decide before you order.
Fabric & Detail
The base of XO309 is a fluid stretch jersey that moves with you through a full evening. Scattered pearl embellishments are placed across the bodice and down the skirt, catching light without covering every surface — the dress reads polished rather than overdone. Diagonal ruching shapes the midsection, and the boning inside the bodice holds the sweetheart neckline securely in place all night. The gown finishes with a small sweep train and a front high slit that shows through the seam panel when you walk.
Key Features
- Strapless sweetheart neckline with pronounced center dip
- Scattered pearl embellishments across bodice and skirt
- Diagonal ruching across bodice and hip
- Boned bodice for structure and all-night support
- Front high slit in the seam panel
- Sweep train
- Lace-up corset back with crisscross closure
- Fluid stretch jersey base
- Available in Periwinkle, Pink, and Sage
Style & Occasion
Portia and Scarlett XO309 is designed first and foremost for prom. The combination of pearl detail, a structured sweetheart bodice, a front slit, and a train makes it a strong choice for formal dances, evening galas, and pageant competitions as well. The three colorways give you real options: Periwinkle reads cool and distinctive under ballroom lighting, Pink is soft and camera-friendly, and Sage is a quieter, fashion-forward choice that photographs well in natural light. If you are part of a court or damas group, all three colors are available so your group can coordinate without wearing identical dresses. Pair with strappy heeled sandals and minimal jewelry — the pearl detailing carries the look on its own.
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.
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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
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Portia and Scarlett XO309 Strapless Sweetheart Pearl Fitted Gown with Train
Sale price $769 CAD
Need help?
Frequently Asked Questions
Yes — you can absolutely try Portia and Scarlett XO309 at home before committing. Marlas Fashions accepts returns on unworn, unaltered dresses with tags still attached. You have three options when you return: a full store credit (it never expires, so you can use it whenever you find the right dress), an even exchange for a different size or color, or a refund minus a 30% restocking fee. The restocking fee exists because each dress is individually inspected and repackaged before it can go back on the floor. That said, the store credit route is genuinely useful — many customers try a dress at home, realize they want a slightly different color or size, and use the credit to reorder the exact swap. To be eligible for any return, the dress must come back in the same condition it was shipped: no wear, no alterations, no stains, no removed tags. We do not accept returns on dresses that have been hemmed, taken in, or otherwise altered, so hold off on booking your tailor until you have confirmed the dress is a keeper. Given that XO309 has a lace-up corset back, you have a built-in sizing buffer — you can try it on, lace it to your measurements, and get a realistic sense of how it will fit at the event before you make a final decision. If you are genuinely torn between two sizes, order the one that fits your hips (the widest point) and use the corset lacing to bring in the waist. Most customers find this eliminates the guesswork entirely. Shipping runs 7–12 business days standard, with rush options available if your date is close. For any questions before or after your order, you are welcome to text or WhatsApp our team — we are happy to walk through sizing, colors, or the return process with you in real time.
A lot of fitted long prom gowns choose one focal point — a heavily beaded bodice, a dramatic slit, or a bold back closure. XO309 layers several details that each hold their own without competing. The scattered pearl embellishment is the most visible distinction: pearls are placed across the bodice and run down the skirt, but the spacing keeps the dress from reading as fully covered. The effect is refined rather than maximalist — it photographs well from every angle without overwhelming the wearer. The diagonal ruching is the second detail that separates it. Most ruched gowns run ruching straight across the stomach. XO309 runs the gather diagonally from the bodice across the hip, which creates a more sculptural shape and tends to be more flattering across a wider range of body types. It draws the eye across the body rather than straight across, which reads as more dynamic in photos. The third differentiator is the combination of the front high slit with the sweep train. The slit sits in the front seam panel — it shows when you walk or dance, which creates movement without cutting through the fitted skirt itself. The train is a sweep length, meaning it extends just enough to photograph beautifully without requiring you to carry it. Finally, the lace-up corset back does real structural work here. The boning inside the bodice holds the sweetheart neckline up without any straps, and the lace-up back lets you adjust fit to your body rather than relying entirely on a seam alteration. For a strapless gown worn for a full evening of dancing, that combination of boning and lace-up closure is genuinely more secure than a standard zipper back at the same price point. The result is a gown that works for prom, formal dances, evening galas, and pageant stages — dressed up or pared down depending on how you accessorize.
The back of XO309 closes with a lace-up corset closure that runs the full length of the back seam. To put it on, step in from the top or pull it over your head, position the bodice so the sweetheart sits correctly across the bust, and then have someone lace it up from the bottom, working their way up. You want the lacing firm enough that the bodice does not move when you walk, but not so tight that it restricts breathing or creates visible compression at the back. The standard approach is to lace to your comfort and tie off at the top with a bow that can be tucked away. Because the back has crisscross lacing, you can redistribute tension along the back — tighter at the waist, slightly looser above the hips — which is harder to do with a standard zip. If the dress arrives and the gap between the two back panels is large, that simply means you ordered a size up from your bust measurement, which is common when customers are fitting to their hips first. A tailor can take in the side seams to eliminate the gap if needed, but most customers manage it entirely through the lacing without any alteration. If you are unsure how snug to lace, aim for two fingers of room — you want security without restriction, especially if you plan to eat, sit, and dance for several hours.
XO309 is available in Periwinkle, Pink, and Sage — three distinct colors that are different enough to individualize each person in a group while still reading as coordinated when photographed together. Periwinkle and Sage both photograph as cool tones, so they pair naturally. Pink is the warmest of the three, and it sits well alongside either of the other two without clashing. If your group wants a mixed-color court, a practical approach is to assign one color to the queen or honoree and distribute the other two across the court members. Because the gown silhouette is identical across all three colors, the group reads as unified in photos even when the colors differ. For larger groups, we recommend confirming availability of all three colors before placing individual orders — contact our team and we can check current stock across sizes and colorways so no one ends up with a substitution at the last minute.
XO309 runs true to standard Portia and Scarlett sizing. To find your best size, measure your full bust, natural waist, and the widest point of your hips, then compare to the designer's size chart. For this gown, hip measurement is usually the deciding factor — the fitted skirt has limited ease through the hips, so size to your hip first. If your bust and hip fall in different size ranges, size to the hip and use the lace-up corset back to bring in the waist. Standard prom dresses are cut for a height of approximately 5'9" with heels. If you are shorter, plan for a hem alteration — the sweep train and front slit both affect where the hem needs to land, so work with a tailor who has experience with formal gowns. If you are taller, the sweep train may sit closer to the floor than shown, which can actually look intentional. For personalized sizing guidance, our team is happy to help you measure and compare before you place your order.
XO309 is designed primarily for prom but the level of detail and the fitted evening-gown silhouette make it appropriate for a wide range of formal events. Formal dances and school galas are a natural fit. Evening award ceremonies, charity galas, and formal fundraisers work well because the gown reads sophisticated rather than exclusively teenage-prom. Pageant competitions are another strong match — the pearl embellishment, the train, and the structured bodice all translate well on a pageant stage. For black-tie events, the sweep train and pearl detail give it enough formality, though the front slit and the open lace-up back make it more suitable for younger wearers or fashion-forward guests than for conservative formal occasions. As a wedding guest, the open back and front slit suit evening receptions and black-tie celebrations best, where a dressed-up, fashion-forward look is fully at home. Every XO309 order is hand-inspected before shipping so the fit and finish arrive flawless. If you are between sizes on the XO309, send our team your measurements before ordering and we will advise.
The boned bodice of XO309 is built to support the sweetheart neckline without straps, so most wearers do not need an additional bra. If you want extra security, a strapless adhesive bra or a low-profile sticky bra cut below the sweetheart line works well — just make sure it sits below the neckline so it does not show. Standard underwear works fine since the jersey skirt drapes smoothly, but if you want a completely smooth line through the ruched hip section, seamless briefs or shaping shorts are a clean option. Avoid anything with a visible waistband that sits above the hip, as the diagonal ruching in that area is fitted and will catch the outline. Shapewear that extends below the high slit line can bunch at the opening when you walk, so keep any shaping garments to mid-thigh or shorter. If you are wearing the gown for a long evening, comfort through the waist matters — the corset back lets you adjust the fit as the night goes on, so you are not locked into one level of tightness from the moment you put it on.
All three colorways — Periwinkle, Pink, and Sage — are photographed in the product images, so you are seeing accurate representations of the actual fabric. Periwinkle is a medium cool blue-purple that reads distinctly under ballroom or event lighting; it is a strong choice if you want a color that stands out without going into jewel-tone territory. Pink is a soft, warm mid-pink that photographs well in natural light and under indoor event lighting — it is the most universally flattering of the three and tends to read a little lighter in person than it appears on screen. Sage is a muted, dusty green that sits in the fashion-forward range; it reads more grey-green in low light and more green in daylight. If you are choosing based on photos, keep in mind that screen calibration can shift perceived color slightly — Sage in particular can appear slightly bluer or greener depending on your device. If you are deciding between two colors and cannot see them in person, our concierge team can sometimes provide additional reference photos or fabric comparisons. Text us at +1 416-536-2956 or reach us on WhatsApp at +1 213-868-3131 and we will do our best to help you choose before you order.