Spring Notion Baby Boys' Modern Fit Dress Suit Set Single breasted jacket, slightly tapered at the waist. Fully lined. 100% Polyester White long sleeve dress shirt (65% polyester, 35%cotton) For size 2T-4T, pants has flat front and elastic back. For size 5 to 20, pants has button zipper front and elastic sides. Fully lined vest. For up to size 6, neck tie is a clip tie, for size 7 and up adjustable around the neck tie with buckle at back for easy closure. For best fitting, please refer to size chart picture, under product pictures.