Acne Studios 

Ryder Wool Mohair Drawstring Trousers in Dark Navy Blue

Size:  52 / US 42 / XL

Wool and mohair-blend 
Slim tapered leg
Elasticated drawstring waistband
On-seam pockets
Back welt pocket
Inseam:  31.5 inches

73% wool, 27% mohair
Pocket lining:  65% polyester, 35% cotton