Spring Notion Baby Boys' Formal Black Dress Suit Set Single breasted black jacket with two buttons. This class fit dress suit is styled with a more relax fit than our Modern Fit Dress Suit ( B017WNY3B4 ). White long sleeve dress shirt. Baby pants has elastic waist. Size 2 to 4 has flat front and elastic back.Size 5 and up pants has button front and zip fly, plus elastic back. Adjustable around the neck tie with buckle at back for easy closure. Shirt: 65%polyester 35%cotton. Jacket, vest, pants 100% polyester. For best fitting, please refer to size chart picture, under product pictures.