Trench coat by Kenzo Paris (c. 1980s), made from black wool fabric with twill weave. The coat has a single button at the neck, where it can be fastened, or otherwise worn open, and it can also be cinched via self-fabric belt. Raglan sleeve should allow some flexibility in terms of fit in the shoulder, and coat has significant flare through body to hem.

Size 2 (JP mens M)
Check measurements to confirm fit
All measurements taken flat

Shoulder width: 50 cm (approx, raglan sleeve)
Width (at underarms): 59 cm

Waist width: 54 cm
Length (neck seam to hem): 120 cm

Sleeve length: 52 cm (approx, raglan sleeve)
Hem width: 67.5 cm

100% wool