waist size

Translations
размер талии
He needed to know his waist size to buy new pants.
Ему нужно было знать свой размер талии, чтобы купить новые брюки.
Definitions
Waist size refers to the measurement around the narrowest part of the torso, typically just above the belly button. It is often used in clothing sizing and health assessments to indicate body shape and potential health risks associated with obesity.