ToBeInStyle Boy's Button Down Shirt and Shorts Set Pull On closure Boy's Two Piece Set. Variety of Styles. Includes Button Down Shirt and shorts. Materials: 60% Cotton, 40% Polyester Machine Wash Ok. Tumble Dry Low. Do Not Bleach. Available in sizes: 12M, 18M, 24M, 2T, 3T, 4T, 4-5, 6, 7-8 Sizes are true to size. Model is 4.5 years old, wearing size 4.