Banana Republic COTTON OPEN-BACK SWEATER TOP New with tag size XS Color Navy Blue Stripe We're obsessed. This cotton sweater is as easy to style as your favorite tee, but it has an pen-back design so it feels special. Crafted in soft, 100% cotton. Fitted: Slim. Sits close to the body. Crew neck. Adjustable slider belt detail at back. Straight hem. 100% cotton.