Hi, welcome to TRIANGL!
To measure your waist for the bikini bottoms, wrap the measuring tape around the narrowest part of your waist, which is usually just above your belly button and below your rib cage. Make sure the tape is snug but not too tight, and keep it parallel to the floor.
For the MAIA - MATO Red Terry Towelling Scoop Bikini Set, the size is recommended based on both waist and hip measurements, with the waist measurement being crucial. You can check out the full size guide here for more details: [https://triangl.com/pages/size-guide](https://triangl.com/pages/size-guide)
Is there anything else I can help you with?
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