Y's by Yohji Yamamoto Apparel Size Guide. Clean up your act to a T with this Y's by Yohji Yamamoto™ blouse. Boat neck. Back zip closure. Long sleeves with button cuffs. Body: 85% wool, 15% silk. Bodice: 90% wool, 10% nylon. Dry clean only. Made in Japan. Measurements: Length: 26 in. Sleeve Length: 33 in.