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.

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 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 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.

Can the Classic Square Neck One Piece fit up to an E cup?

Yes. The Classic Square Neck One Piece is designed to support a wide range of bust sizes, from A to J cup sizes. Many women with larger busts love this style for its supportive, secure fit and wear it in their usual clothing size.

Does the Classic Square Neck have tummy control?

Yes. The Classic Square Neck One Piece is designed with a fully lined and carefully panelled bodice for a supportive, firm fit that helps flatter and shape the body. The elegant lines are designed to feel secure and sculpting, while the fit may vary depending on your body shape and personal preference.

Classic Square Neck One Piece Swimsuit
Cobalt Blue Gingham

Name: Classic Square Neck COBALT BLUE GINGHAM
Brand: UNE PIECE
SKU: CSN-GCB-6
Price: 224.1 AUD
Availability: InStock
Rating: 4.7 (1874 reviews)

$249.00 AUD $224.10 AUD

Colour:

Only 5 pieces in stock

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 are.

BUST SUPPORT: Excellent bust support without cups or padding. Perfect for any bust size.
BOTTOM 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 bottom 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 - Australia

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

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

Note: Place your order by 1pm AEST for same-day dispatch.

Find all shipping times at unepiece.com/shipping.

Method	Time	Cost
Express	1-2 business days	FREE - Orders over $250 $9.95 - Orders under $250
Standard	2-5 business days	FREE - Orders over $200 $8.95 - Orders under $200

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

Exchange - Free exchanges must be initiated and received within 14 days of your order's delivery date.
Return for store credit - Free returns for store credit must be initiated within 14 days of your order's delivery date.
Return for original form of payment - Returns must be initiated and completed within 14 days of your order's delivery date. Mail-in returns have a $9 handling fee per return label (which is waived if you opt for store credit or an exchange!)

Please note that sale items, earrings, underwear, and bralettes are final sale and not eligible for return or exchange.

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

Learn more at unepiece.com/returns.

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.

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 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: 4.709557 / 5 from 1873 reviews.

AI Generated Review Summary

This luxury one-piece swimsuit is celebrated for its flattering and stylish look, vibrant color, and perfect fit. Customers rave about its supportive and firm fit, high-quality fabric, and excellent support. The sustainable materials and UV protection add to its appeal.

Summary topics

Appearance: 8%
Color Accuracy: 10%
Fit: 31%
Support: 10%

Review topics: ["size","fit","band","colour","length","quality","looks","support","material","design","straps","suit","fabric","construction","cut","issues","lining","comfort","shape","price","feel","style","customer service","pants","coverage","neckline","pattern","wear","texture","structure"].

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
"Stunning swimsuit, gorgeous fabric, fit and support." — Janelle R.

Reviews

Best suit!

"I have this suit in black from last season and bought navy blue this year. They are the only suits I wear and always get compliments. I do not wear the bows. For reference, I’m 54 years old, wear a size 6 , 34 DD and I never worry about a wardrobe malfunction with this suit. Very flattering!"

— Marisa P. (5/5)

Absolutely in LOVE with the

"Absolutely in LOVE with the quality and fit of this one! The fabric is buttery soft and feels amazing on the skin! There is a perfect ratio of stretch and firmness ensuring a secure, comfortable and flattering fit. Only thing is add is padding around the ‘ladies’ - not everyone needs to know when I’m feeling cold! 🤣 Definitely 10/10!"

— Rachel C. (5/5)

Pleasant surprise!

"I am always skeptical about ordering online but, wow, was I surprised. Bathing suit fit exactly according to size chart, held me in in all the right places, and is really high quality. I loved everything about the suit and it arrived in one day! Could not be happier and definitely ordering another."

— Nicole M. (5/5)

I purchased this suit along

"I purchased this suit along with another one right before vacation. The fit was perfect, style was great. I would purchase additional pieces again"

— Danita F. (5/5)

I ordered a small (equivalent

"I ordered a small (equivalent to a size 10); it is true to size & very flattering on. This is my first swim suit after having a baby & it fits & feels great. A medium would be too big. I have DD/E cups and I feel like the top doesn’t hold them up as I would prefer, but if I wear a discreet bra underneath it’s perfect - not ideal but I understand this swim suit is not specifically made for cup sizes."

— Rosa L. (5/5)

I love this suit. The

"I love this suit. The Support is amazing. Love the neckline and the wide-set straps. Highly recommend."

— Elizabeth D. (5/5)

I’m so excited to wear

"I’m so excited to wear this bathing suit. My only critique is that I would prefer a little more smoothing affect. The bows are so cute."

— Cara C. (5/5)

Great colour and size. Nice

"Great colour and size. Nice support in the bust for larger breasts. Fabric is a little loose after first wear. Would probably size down next time"

— Kimberley H. (4/5)

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)

Q&A

Frequently Asked Questions

Both our Crinkle and Classic one piece swimsuits are designed with supportive bust features. Our Crinkle cut swimwear has superior built-in bust support with removable padded inserts, giving it a soft, flexible, and supportive fit. Our Classic one piece features InvisiBust Support Technology for excellent bust support with a firmer, more sculpting feel on the body.

Classic Square Neck One Piece Swimsuit
Cobalt Blue Gingham

How to measure

AI Generated Review Summary

Summary topics

Review highlights

Reviews

Best suit!

Absolutely in LOVE with the

Pleasant surprise!

I purchased this suit along

I ordered a small (equivalent

I love this suit. The

I’m so excited to wear

Great colour and size. Nice

This suit is heaven. MY

I LOVE this suit! My

Q&A

Frequently Asked Questions

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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 Cobalt Blue Gingham

AI Generated Review Summary

Summary topics

Review highlights

Reviews

Best suit!

Absolutely in LOVE with the

Pleasant surprise!

I purchased this suit along

I ordered a small (equivalent

I love this suit. The

I’m so excited to wear

Great colour and size. Nice

This suit is heaven. MY

I LOVE this suit! My

Q&A

Classic Square Neck One Piece Swimsuit
Cobalt Blue Gingham

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