"Waist definition" refers to the visibility and shape of the waist area on the body. It implies having a well-defined and noticeable waistline, often representing a slimmer and curvier figure. Full definition
Wear it like an open cape, or belt it for waist definition. (styledoctors.us)
Because there is little waist definition, there is likely to be only a narrow waistband or sometimes no waistband at all. (style-yourself-confident.com)
I wouldn't get it if you want any kind of waist definition. (renttherunway.com)