Coat (or long blazer, but on balance closer to coat) and trouser suit from yohji yamamoto line Y's for Men, made from thick, dark navy / grey wool check fabric. Coat (or blazer or jacket) has notch lapels, slightly unusual 4 button front, flap pockets at waist. Trousers have double pleated front, loose cut through top but aggressively tapered to hem.

Coat L, trousers S (mens), likely fits AU mens S-M
Check measurements to confirm fit
All measurements taken flat

Coat measurements
Shoulder width: 50.5 cm
Width (at underarms): 59.5 cm
Waist width: 56 cm
Length (neck to hem): 87.5 cm
Sleeve length: 60 cm
Hem width: 60.5 cm

Trouser measurements
Waist (circumference): 81 cm
Front rise:
 34 cm
Thigh width:
 36.5 cm
Total length: 102.5 cm
Inseam length:
 73.5 cm
Cuff width: 21.5 cm

100% wool
Made in japan