NWT Baby Gap set Shirt is a size 4T and leggings are a 5T Shirt is 100% cotton and leggings are a cotton/spandex blend Actually it's more like a long shirt or shirt/dress if that's a thing! baby Gap Matching Sets Leggings, Shirt Dress, Cotton Spandex, Baby Gap, Clothes Design, Plus Fashion, Gap, Matching Sets, Long Shirt