This is a SHEIN dress. It has a collar. Button-down front. 【Sizes】 The dress on the left is 12-18M. The dress on the right is 18-24M. In reality, I think they are about the same size. I bought them last year, but they were too big and my child didn't wear them much. This year, my child doesn't like wearing dresses, so I haven't put them on. Currently, my child is a small 2 and a half years old, and they seem to fit just right. Please note that these are used items, so please refrain from purchasing if you are concerned.