FAQs - ITT SWIM

Our sizes run true to size and are based on U.S. sizing.
If you’re between sizes, we recommend sizing up for more coverage or down for a snugger fit.

TOPS

Size	Cup Size	Bust (in / cm)	Underbust (in / cm)
XS	32–34A	31–33" / 79–84 cm	27–28" / 69–71 cm
S	32–34A–B	33–35" / 84–89 cm	28–30" / 71–76 cm
M	34B–C	35–37" / 89–94 cm	30–32" / 76–81 cm
L	36C–D	37–39" / 94–99 cm	32–34" / 81–86 cm

For triangle and bandeau styles, choose based on your preferred coverage and bust support.

BOTTOMS

Size	US Size	Waist (in / cm)	Hips (in / cm)
XS	0–2	23–25" / 58–64 cm	33–35" / 84–89 cm
S	2–4	25–27" / 64–69 cm	35–37" / 89–94 cm
M	6–8	27–29" / 69–74 cm	37–39" / 94–99 cm
L	8–10	9–31" / 74–79 cm	39–41" / 99–104 cm

For a cheekier fit, size down. For more coverage, size up.

ONE PIECE

Size	US Size	Bust (in / cm)	Waist (in / cm)	Hips (in / cm)
XS	0–2	31–33" / 79–84 cm	23–25" / 58–64 cm	33–35" / 84–89 cm
S	2–4	33–35" / 84–89 cm	25–27" / 64–69 cm	35–37" / 89–94 cm
M	6–8	35–37" / 89–94 cm	27–29" / 69–74 cm	37–39" / 94–99 cm
L	8–10	37–39" / 94–99 cm	29–31" / 74–79 cm	39–41" / 99–104 cm

How to Measure: Use a soft measuring tape and measure directly against your skin. Stand naturally — don’t pull the tape too tight.

Bust: Measure around the fullest part of your bust, keeping the tape level across your back.
Underbust: Measure just below your bust, around your ribcage.
Waist: Measure around the narrowest part of your waist, typically above your belly button.
Hips: Measure around the fullest part of your hips and bum, keeping the tape straight and snug but not tight.

Tip: If you’re in between sizes, choose the larger size for comfort or the smaller for a more fitted look.

Note: Sizes are not printed or stitched on our products — they appear only on the hang tags for a clean, seamless look.

PRE-ORDER & OUT OF STOCK ITEMS

Want something that’s currently unavailable?
Email info@ittswim.com and we’ll let you know as soon as it’s back in stock or available for pre-order.