These slacks are from the same brand as the slacks I'm currently selling. They contain a bit of cotton, so they can be worn in the summer. The tag size is 13, but the waist is slightly wider than a size 11, although the rest of the measurements are the same as a size 11. Size 13 Flat measurements (please use as a reference): Waist: 83cm Inseam: 71cm Thigh width: 29cm Leg opening: 19cm Material: 57% Polyester 35% Cotton 8% Polyurethane Teijin Frontier Co., Ltd. Two pockets in the front and two in the back. Front zipper. The polyurethane content provides stretch. There is 4.5cm wide elastic in the back.