This is a GAP long-sleeved shirt with a check pattern. The lining is navy gauze material, and it's layered with the outer fabric. The fabric is soft and stretchy, making it easy to wear. There are two buttoned pockets on the front. When they were small, they mostly wore clothes that you pulled over their head, so a button-up shirt was special for going out✩ I think it can also be used as a light jacket over a T-shirt in the coming season. Thank you for looking.