Classic Square Neck One Piece Swimsuit
Navy

Name: Classic Square Neck NAVY
Brand: UNE PIECE
SKU: CSN-N-6
Price: 273.0 CAD
Availability: InStock
Rating: 4.7 (1820 reviews)

$304.00 CAD $273.00 CAD

Color:

Our best-selling and most-loved swimsuit since the day it was launched. Featuring an elevated square neckline with removable-bows that creates two beautiful looks.

Wildly flattering and confidence boosting - it will be the swimsuit you reach for on repeat.

BOOB SUPPORT: Excellent bust support without cups or padding. Perfect for any bust size.
BUTT COVERAGE: High coverage. Our fullest coverage.
COMPRESSION: A firm, supportive fit that features panelling that lifts the bust and contours the body. Swimwear should fit snuggly when dry, so it will remain supportive when wet.

Excellent bust support with InvisiBust Support Technology for a firm, supportive fit
Designed to support A–J cup sizes
Good butt coverage
Ultra chlorine resistant to help maintain colour and elasticity
Pilling and sun-cream resistant fabric for longer wear
Fully lined with recycled and sustainable fabrics for a soft, comfortable feel against the skin
Removable bows to switch between minimal and playful looks
UPF50+ sun protection that blocks 98% of UV rays

Fast Shipping - United States

We offer fast and reliable shipping options from our US warehouse:

Express: 1-2 business days
Standard: 2-5 business days

Note: Place your order by 2pm EST for same-day dispatch.

Find all shipping times at us.unepiece.com/shipping.

Method	Time	Cost
Express	1-2 business days	FREE - Orders over $250 USD $19.99 - Orders under $250
Standard	2-5 business days	FREE - Orders over $150 USD $9.99 - Orders under $150

Starting a return or exchange is easy! Exchanges and store credits are free.

All returned products must be unused, with original tags attached and hygiene stickers intact.

Exchange - Free exchanges must be initiated and received within 21 days of your order's delivery date.
Return for store credit - Free returns for store credit must be initiated within 21 days of your order's delivery date.
Return for original form of payment - Full-priced item returns must be initiated and completed within 21 days of your order's delivery date. Mail-in returns have a $15 handling fee per return label (which is waived if you opt for store credit or an exchange!)

Please note that earrings, underwear, bralettes and items marked final sale, are not eligible for return or exchange. Products on sale are available for exchange or credit only. Read our full policy here.

Our first model wears size AU 8 (US 4) and is 179cm (5'10.5") tall. Our second model wears size AU 10 (US 6) and is 169 cm (5’7”) tall.

UNE PIECE is available in womens sizes US 2 to 20 (AU 6 to 24). We follow standard sizing guidelines and make our products true to size.

Our swimsuits are constructed with a firm fit to flatter your shape. If you are between sizes, we recommend choosing the larger of the two sizes. For example, if you wear a size 10 in the top but a size 12 on the bottom (or vice versa) we recommend you purchase a size 12.

Find size measurements and international size conversions at us.unepiece.com/sizing.

Main: 78% Recycled Nylon 22% Elastane
Lining: 91% Recycled Nylon 9% Elastane

To keep your UNE PIECE looking beautiful, please carefully follow our care instructions:

- Cold hand wash.
- Do not soak, bleach or dry clean.
- Do not spin or tumble dry.
- Do not iron.
- Line dry out of direct sunlight.
- Do not pack or store when wet.
- Remove any excess water and dry without delay.
- Separate light colours from dark before washing.

CM IN

AU/UK	Bust	Underbust	Waist	Hips
US	Bust	Underbust	Waist	Hips
6 (XS)	76 - 80	64 - 68	59 - 63	86 - 90
8 (S)	81 - 85	69 - 73	64 - 68	91 - 95
10 (S)	86 - 90	74 - 78	69 - 73	96 - 100
12 (M)	91 - 95	79 - 83	74 - 78	101 - 105
14 (M)	96 - 100	84 - 88	79 - 83	106 - 110
16 (L)	101 - 105	89 - 93	84 - 88	111 - 115
18 (L)	106 - 110	94 - 98	89 - 93	116 - 120
20 (XL)	111 - 115	99 - 103	94 - 98	121 - 125
22 (XL)	116 - 120	104 - 108	99 - 103	126 - 130
24 (XXL)	121 - 125	109 - 113	104 - 108	131 - 135
2 (XS)	29.9 - 31.5	25.2 - 26.8	23.2 - 24.8	33.9 - 35.4
4 (S)	31.9 - 33.5	27.2 - 28.7	25.2 - 26.8	35.8 - 37.4
6 (S)	33.9 - 35.4	29.1 - 30.7	27.2 - 28.7	37.8 - 39.4
8 (M)	35.8 - 37.4	31.1 - 32.7	29.1 - 30.7	39.8 - 41.3
10 (M)	37.8 - 39.4	33.1 - 34.6	31.1 - 32.7	41.7 - 43.3
12 (L)	39.8 - 41.3	35 - 36.6	33.1 - 34.6	43.7 - 45.3
14 (L)	41.7 - 43.3	37 - 38.6	35 - 36.6	45.7 - 47.2
16 (XL)	43.7 - 45.3	39 - 40.6	37 - 38.6	47.6 - 49.2
18 (XL)	45.7 - 47.2	40.9 - 42.5	39 - 40.6	49.6 - 51.2
20 (XXL)	47.6 - 49.2	42.9 - 44.5	40.9 - 42.5	51.6 - 53.1

Size	AU/UK	US	EU/FR ES/PT	DE	IT	JP
XS	6	2	34	36	38	5
S	8	4	36	38	40	7
S	10	6	38	40	42	9
M	12	8	40	42	44	11
M	14	10	42	44	46	13
L	16	12	44	46	48	15
L	18	14	46	48	50	17
XL	20	16	48	50	52	19
XL	22	18	50	52	54	21
XXL	24	20	52	54	56	23

Our swimwear is designed for a firm, flattering fit. If you find yourself between sizes, we recommend selecting the larger size for optimal comfort.

How to measure

Bust: Using a flexible tape measure, measure across the fullest part of your chest, ensuring the tape measure is straight across your back.
Underbust: Measure directly under your bust, where the band of a bra would sit.
Waist: Measure around your natural waistline — this is the narrowest part of your torso, usually right above your belly button.
Hips: Stand with your heels together and measure around the fullest part of your hips and bottom.

Overall rating: 4.708951 / 5 from 1821 reviews.

AI Generated Review Summary

The Classic Square Neck NAVY swimsuit is praised for its beautiful design, excellent quality, and supportive fit. Customers love the removable bows, stunning square neckline, and panelled bodice. The fabric is highly rated for its sustainability, UPF50+ protection, and resistance to pilling, chlorine, and sun cream.

Summary topics

Color: 10%
Fabric Quality: 12%
Support: 10%
One Piece Design: 8%
Appearance: 8%

Review topics: ["size","fit","length","support","straps","fabric","waist","colour","quality","material","looks","issue","feel","shape","lining","addition","stretch","comfort","design","shirt","customer service","cut","pattern","legs","style","coverage","neckline","shipping","texture","padding"].

Review highlights

"Absolutely divine bathers, the colour, style and fit are great and I feel comfortable and confident" — Stacey B.
"Beautiful high quality fabric, love the look with the bows, I think it elevates the look." — Carmen
"Absolutely love my Une piece, perfect fit and the colour is just stunning" — michelle l.

Reviews

This suit is heaven. MY

"This suit is heaven. MY husband commented on how good I look in it. Don't need anything else than that to know that I made the right choice. It hugs in all the right places. The color is vibrant. I absolutely love it."

— Ann R. (5/5)

I LOVE this suit! My

"I LOVE this suit! My tummy is my trouble area, and this suit is flattering all around! Love the material, love the brown color, and love the ties on the shoulders! The chest area gaps a little bit and is low, so I may get that part altered to hold in the chest a little better, but overall obsessed."

— Allison L. (5/5)

The square neck black texture

"The square neck black texture swimsuit is very stylish. The fabric is of great quality and the style is very becoming. Unfortunately I am sometimes between sizes and ordered the larger size based on the measurements, I think it would look better with a firmer fit. Too late to exchange, but I’ll know better when I order my next Une Piece."

— Suzanne R. (5/5)

I love it when u

"I love it when u can put a pair of swimmers on and forget about them. There is nothing worse than tugging and adjusting at your swimmers the whole time to keep all your bits covered. These are a classy, elegant and beautifully designed one piece that embraces the female curves and celebrates them. I actually forgot I even had swimmers on! I love the print and the fabric and no longer experience the dread that comes when putting on ur togs that aren’t really working for you. I am looking forward to adding to my unepiece collection."

— Gailene K. (5/5)

This is a beautiful swimsuit.

"This is a beautiful swimsuit. Such a flattering fit and love the gorgeous polka dot fabric. My most exciting swimsuit in a long time. Even my husband commented on how nice it is and he rarely comments on any new purchase."

— Kristina W. (5/5)

Amazing swimsuit and cute print.

"Amazing swimsuit and cute print. The stomach and bust are well supported, and bum coverage is perfect. The shape of the swimsuit being square around the bust is super flattering. Removable ties on the shoulder make it more casual or dressy depending on where you're wearing it. Incredible fabric, fit and design - I couldn't ask for a more perfect, flattering swimsuit."

— Melissa G. (5/5)

Love the square neckline! Something

"Love the square neckline! Something different! I ordered a Size 12 as per recommended by the Size Guide but think it should have been a 14. Not sure 'how' I will wriggle into it in Bali in the humidity. Beautiful fabric, super smooth and silky."

— Sharon R. (5/5)

The most perfect swim suit

"The most perfect swim suit I love it!"

— Sian B. (5/5)

Finally found the perfect suit!

"Finally found the perfect suit! Good coverage, support and so comfortable"

— Cristina R. (5/5)

It's pretty but way less

"It's pretty but way less compression than I had hoped for, especially at this price point. I would have returned for a smaller size but apparently missed the 14-day return window. Again, for $200 I would have expected better customer service policies. I've never splurged on such an expensive suit before and am very disappointed."

— Charity M. (4/5)

Q&A

Frequently Asked Questions

What size should I select in the Classic Square Neck one piece?

This style runs true to size with a firm, sculpting fit. If you’re between sizes or have a long torso or curvier hips, go up one size. Suits A–J cup sizes. See the women’s swimwear size guide for measurements when selecting your size.

What size bust is this swimsuit best for?

This style has been designed to support A–J cup sizes with many fuller-busted women reporting excellent support.

Is the Classic Square Neck one piece see-through when wet?

No, this is a fully lined swimsuit is made with recycled lining for reliable coverage in and out of water. The panelled bodice also keeps the fabric flat so it doesn’t go sheer when wet.

Is this a supportive one piece swimsuit for bigger busts without underwire?

Yes. The InvisiBust Support Technology uses a panelled, fully lined bodice to lift and hold without bulky cups or underwire. It’s designed for A–J cup sizes and is praised for how comfortable it is to wear.

Is the fabric UPF50+ and chlorine resistant for pool use?

Yes. The recycled fabric is UPF50+ (blocks 98% of UV rays) and ultra chlorine resistant. Rinse after every swim and line dry out of direct sun to keep colour and elasticity strong.

Will the Classic Square Neck work for a long torso?

Yes! Thanks to the firm stretch and panelled construction. If you usually need extra length, size up for more torso room without losing support.

Size	AU/UK	US	EU/FR ES/PT	DE	IT	JP
XS	6	2	34	36	38	5
S	8	4	36	38	40	7
S	10	6	38	40	42	9
M	12	8	40	42	44	11
M	14	10	42	44	46	13
L	16	12	44	46	48	15
L	18	14	46	48	50	17
XL	20	16	48	50	52	19
XL	22	18	50	52	54	21
XXL	24	20	52	54	56	23

Size	AU/UK	US	EU/FR ES/PT	DE	IT	JP
XS	6	2	34	36	38	5
S	8	4	36	38	40	7
S	10	6	38	40	42	9
M	12	8	40	42	44	11
M	14	10	42	44	46	13
L	16	12	44	46	48	15
L	18	14	46	48	50	17
XL	20	16	48	50	52	19
XL	22	18	50	52	54	21
XXL	24	20	52	54	56	23

Classic Square Neck One Piece Swimsuit Navy