Classic Square Neck One Piece Swimsuit
Black

Name: Classic Square Neck BLACK
Brand: UNE PIECE
SKU: CSN-B-6
Price: 93.95 EUR
Availability: InStock
Rating: 4.7 (0 reviews)

€93,95 EUR

This is a final sale item and cannot be returned unless faulty

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. This smooth fabric is a true to size fit, please purchase the size you normally are.

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 without bulky cups
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

50% off sale items are not eligible for refund nor exchange: store credit only. See promotion terms.

Please note also that earrings, underwear, bralettes and items marked final sale, are not eligible for return nor exchange.

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!)

Our first model wears size AU 8 (US 4). She is 179cm (5'10.5") tall with an 84cm (33") bust, a 69cm (27") waist and 94cm (37") hips.

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: 0.0 / 5 from 0 reviews.

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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 Black

AI Generated Review Summary

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Q&A

Classic Square Neck One Piece Swimsuit
Black

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