Knee-length means reaching down as far as the knee. A knee-length skirt, knee-length boots, knee-length socks.
It is one of a family of clothing measures with ankle-length and floor-length, all naming where the hem stops. It goes before the noun and never after the verb.
1adjectiveknee-lengthReaching down as far as the middle of the leg.
“She wore a plain knee-length coat over everything.”
knee-length is a quality.
Practised in Clothes & Fashion