adidas Y3 Women's Apparel Size Guide. Keep your cool with these casual leggings from adidas Y-3 by Yohji Yamamoto™. Elastic waist. Signature stripes at the side. Tapered leg. 66% viscose, 31% polyamide, 3% polyurethane. Dry clean only. Imported. Measurements: Waist Measurement: 26 in. Outseam: 40 in. Inseam: 32 in. Front Rise: 8 in. Back Rise: 12 in. Leg Opening: 10 in.