Due to my owning this store, I thrift ALOT and I honestly can say this is a really strange and cool find. It's a vintage piece because of the detailing work, the sleeve has a dart in the cap which isn't something you'd see in newer items but its really simple with straight darts in the front and back to give it some definition on the body and it is cut in fleece. Lined with zipper in back. 

Labeled a large but would work well for a medium who wants to wear it away from the body 

Cotton/poly blend

total length 32inches/81cm

pit to pit 19inches/48cm

waist 16.5inches/42cm

hips 19inches/48cm

shoulder 14inches/35.5cm

sleeve 23inches/58.4cm

underarm 16inches/406cm