This is a set of 3 T-shirts. Sizes are 90-100, depending on the manufacturer. As those with children know, the shoulder width and overall size are almost the same, and my child wore them all at the same time. The size labels vary, but the shirts look to be about the same size. My child wore them at nursery school at the same time. They show some wear and tear, but they have buttons at the neck and are made of soft material, so they were perfect for nursery school. For those who want lots of spares! However, if you are particular about exact sizing or are concerned about minor details, please refrain from purchasing to avoid any issues.