This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
褹 combines the clothing radical 衤 with the phonetic component 埶, but its exact historical development and original meaning are uncertain.
With 衤 (clothing) on the left and 埶 on the right, imagine a garment so rare and obscure that even its purpose is forgotten.
For ゲイ, picture a mysterious garment worn by a gatekeeper named Gay: Gay -> ゲイ, and the strange robe is the 褹.