This is a little bigger than small. So it’s a big Small or Small to Medium in size
Chest Width: 22.0 in. Shoulder Width: 17.25 in. Body Length: 41.0 in. Back Length: 41.0 in. Sleeve Length: 22.5 in. Bottom Hem Width: 0.0 in. Sleeve Opening Width: 6.5 in. Pants/tumban: 39.0 in.