IPA: //ˈweɪstˌbænd//
KK: /ˈweɪstˌbænd/
A strip of material that goes around the waist of clothing, like pants or skirts, to hold them up or keep them in place.
She adjusted the waistband of her skirt before heading out.
Waistband is formed from "waist" (from Old English "waist", meaning the part of the body between the ribs and hips) and "band" (from Old English "banda", meaning a strip or ribbon). The word "waistband" refers to a strip of material that encircles the waist.
Think of the 'waist' as the part of your body where the 'band' wraps around — that's how a waistband holds up your clothing.