Theory Woven Combo Waistcoat in Navy. - size L (also in M, S, XS) Theory Woven Combo Waistcoat in Navy. - size L (also in M, S, XS) 55% cotton 45% polyamide. Imported. Hand wash recommended. Partial front button closure. Buttoned cuffs. Crisp poplin fabric with lightweight knit fabric overlay. THEO-WK274. M1114737. Theory is a visionary concept for modern intelligent fashion forward people. Founded in New York and made by the finest of fabrics, this makes the working everyday person feel powerful, ready to face their day.