cha3
open seam of a garment; shorts; panties

cha4
slit on either side of robe

strokes 8
radical
strokes after radical 3
开衩 開衩 kai1 cha4
slit (in clothing)

裤衩 褲衩 ku4 cha3
underpants

三角裤衩 三角褲衩 san1 jiao3 ku4 cha3
briefs; panties