noun
drop from collar to hem; collar-to-hem measurement
Used for kimono, yukata, and similar garments. Refers to the vertical distance from the back collar (衿) down to the bottom hem.
着物の衿下を長めに仕立ててもらった。
I had the kimono made with a longer collar-to-hem drop.
この浴衣は衿下が短すぎて、着ると裾が上がってしまう。
This yukata's collar-to-hem measurement is too short, so the hem rides up when worn.