A cotton shirt jacket (shirt coat?) from yohji yamamoto line y's for men. It has a zipped front placket, single shirt style breast pocket, and single button cuffs. The addition of a hood makes the jacket feel sort of like a parka, but mostly like something in between a shirt a jacket and a coat.

No marked size (mens), should fit approx AU L or M depending on desired fit
Check measurements to confirm fit
All measurements taken flat

Shoulders: 53.5 cm
Width (chest): 65 cm
Length (back collar to hem): 81 cm
Sleeve length: 62 cm

100% cotton
Made in japan
1990s