Fit Guide

Finding Your Perfect Fit

Sis Swim is designed to flatter every body and move with you all day. Our pieces follow true Australian sizing (XS–XL).

Tops: Adjustable styles with low to moderate coverage for a custom, comfortable fit. Bottoms: From cheeky to medium coverage—see individual product pages for details. Pro tip: If you're between sizes, we recommend sizing up for extra ease.
Model measurements and sizing notes are listed on each product page. Still unsure? Reach out - we're happy to help.