Brown, wrinkled polyester long sleeve top by Issey Miyake ME. Top has a round neck, and fabric is just very-slightly sheer.

No marked size (womens / unisex)
Check measurements to confirm fit
All measurements taken flat

Shoulder width: 36 cm
Width (at underarms): 43 cm
Length (neck to hem): 57 cm
Sleeve length: 61 cm
Hem width: 43 cm

100% polyester