Size Guide One piece Swimwear

Size Guide

If you need help choosing your size you can use our ‘Find your fit’ tool on each product page, if you need further help please contact our team via the online chat — our fit experts love talking swim and are always happy to help.

If you fall between sizes, we recommend sizing up for the most comfortable fit.

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Find Your Size (UK)

Bust (cm)	Waist (cm)	Hips (cm)	Recommended UK Size
76 – 82	61 – 64	86 – 90	6
82 – 86	64 – 67	90 – 94	8
86 – 91	67 – 72	94 – 98	10
91 – 96	72 – 77	98 – 103	12
96 – 102	77 – 82	103 – 108	14
102 – 107	82 – 87	108 – 113	16
107 – 112	87 – 92	113 – 118	18

 

One-Piece Swimsuits

UK Size	Bust (cm)	Waist (cm)	Hips (cm)
6	76 – 82	61 – 64	86 – 90
8	82 – 86	64 – 67	90 – 94
10	86 – 91	67 – 72	94 – 98
12	91 – 96	72 – 77	98 – 103
14	96 – 102	77 – 82	103 – 108
16	102 – 107	82 – 87	108 – 113
18	107 – 112	87 – 92	113 – 118

Some one-piece styles feature our trademark Subtle Sculpt, designed to offer comfortable stomach control and gentle shaping while maintaining a smooth, flattering silhouette.

Certain styles also include removable pads, built-in cups, or hidden support shelves for additional support.

International Size Conversion

Size	UK	US	EU	AUS
XS	6	2	34	6
S	8	4	36	8
M	10	6	38	10
M	12	8	40	12
L	14	10	42	14
L	16	12	44	16
XL	18	14	46	18

How to Measure

Use a soft measuring tape and measure directly against your body while wearing light clothing or swimwear.

Bust
Measure around the fullest part of your bust while keeping the tape level across your back.

Waist
Measure around the narrowest part of your waistline.

Hips
Measure around the fullest part of your hips while keeping the tape level.

Need Help?

If you have any questions, please contact our fit experts via the online chat — they simply love talking swim and will be happy to assist you in finding your perfect NAIA fit