From ’86~’87 Autumn/Winter Paris Men’s Collections
Special thanks to myclothingarchive for the reference
You can tell that this piece from S80's, Yohji Yamamoto sizes were written in letter form (S/M/L etc.) on the size label. From SS2000 onwards, the Japanese number labelling system was employed.

Sz Small

Measurements

Waistline 34.5
Length 37.5
Leg opening 8
Crotch 14
Inseam 27
Thigh 13