Knicked Tweens & Teens Period Underwear Size Guide

Our period underwear is designed here using Australian Youth underwear guidelines.  It's important to note that youth (child) sizing, also crosses over into women's sizing at our 12/14.

We understand purchasing online can make judging sizing difficult and as everyone has a different body shape (literally hundreds of waist & hip combinations) we have created this guide to help you choose the best fit, or feel free to email our helpful team at with your daughters waist & hip measurements so we can assist.

KNICKED will happily exchange sizing (and cover the cost to repost once per order) if tried on over clean underwear and is returned in as-new condition - forms & instructions can be found on our Exchange Page.

Australian Youth underwear guideline

Knicked Period Underwear Sizing chart