How to make your daughter's first period EASY and FUN!CLICK HERE TO READ.
Welcome to Knicked, Welcome to Puberty and Periods SHOP HERE
Terms & Policies
Please see each product page, for individual sizing.
As a general rule, please choose the same size for our period undies and period swimwear as your child's regular underwear size.
Our period underwear is designed here using Australian Child/Youth underwear guidelines. It's important to note that child sizing, also crosses over into women's sizing at our 12/14, so we have also shown this on our sizing charts (on each individual product page) to assist.
We also understand purchasing online can make judging sizing difficult and everyone has a different body shape (literally hundreds of waist & hip combinations) so we have created guides on each product page to help you choose the best fit for each product, or feel free to email our helpful team at theteam@knicked.com.au with waist & hip measurements so we can assist further.
To measure against existing underwear: use the flat lay measurement (side seam to side seam on the waistband) to compare with their current underwear.
Don't panic if you do find you've ordered the wrong size, KNICKED will happily exchange sizing and also cover the postal costs to reship (once per order) as long as underwear has been tried on over clean underwear and returned in AS NEW condition (not washed/worn free of lint/hair/marks), and packaging in original condition.
Please click here for our Exchange/Refund Forms & Guidelines to organise an exchange.
Shell & Pearl String Bikini Set - 2 Pieces
*NO EXCHANGES and NO REFUNDS on these clearance products, so please choose carefully! *discontinued style or the last one in a size.
Want shell details? Need trendy style? Looking for special deal? Want heavy protection?
We've got you covered.
Black Friday Deal! Chic and trendy shell self-tie bikini top with the choice of either our high-waisted or original period swim brief. Once this set is gone, it's gone!
💖 What Makes It Different?
Unlike regular swim sets, our Shell & Pearl Set features:
✔ BLACK FRIDAY SPECIAL DEAL
✔ Shell & pearl details
✔ Self-tie bikini top
✔ Choice of bottoms (Original OR High-Waisted)
✔ Heavy absorbency period protection
✔ High-Waisted option has StopLEAK
✔ Removable side ties on Original brief
✔ Limited availability - once it's gone, it's gone!
That means trendy shell style PLUS your choice of period-proof bottoms — at a special Black Friday price!
🩰 Perfect For:
• Beach & pool days
• Heavy flow protection
• Shell & pearl lovers
• Trendy chic style
• Black Friday shoppers
• Limited edition collectors
• Special deal seekers
🌿 What's in the Set:
• 🌞1 x Period Swim Brief: Select from our new High-Waisted with StopLEAK or Original swim brief with removable side ties
• 🌞1 x Bikini Top with Shell Details (please it is recommended to hand wash this top to prevent over stretching or damaging the shells)
Please note: Knicked only manufactures the period swim bottoms, we purchase the additional pieces separately to offer a complete outfit.
🌿 Designed for Trendy Style
Created by a mum, designed for real periods.
Our Shell & Pearl Set uses:
• Same technology as our heavy absorbency period underwear
• PLUS a thin waterproof layer
• Choice of Original OR High-Waisted bottoms
• Chic shell & pearl details
• Made to keep you protected in and out of water
Because Knicked Swimwear allows girls to NEVER miss out on the fun when it comes to the water.
Knicked period undies have always been and will continue to be FREE FROM NASTIES such as PUL'S (plastics) or PFAS (chemicals).

* Please see our swim FAQs for more information.


Tracked postage is $9.95
Express postage is $14.50
Orders over $99 receive complimentary FREE REGULAR SHIPPING
Please Note: Clearance Item - no returns/exchanges unless faulty