Khaki / light brown cotton-nylon flight jacket by japanese label ba-tsu (c. 1980s). It has a zipped front, point collar, and ribbing at the cuffs and hem. Cut is roomy, but cinched at the bottom due to the ribbing. Subtly ba-tsu branded leather at the left breast can be detached via press studs if desired.

Decent vintage condition, with faint marks and missing original liner and fur collar

No size (JP mens/unisex)
Check measurements to confirm fit
All measurements taken flat

Shoulder width: 57.5 cm
Width (at underarms): 62 cm
Length (neck to hem): 74 cm
Sleeve length: 60.5 cm
Hem width: 46.5 cm (ribbing, intended to stretch)

More items by ba-tsu here.