Bracuta G9 Original in Navy size 40 (S)

Purchased from Jcrew, and only wore a handful of times. Great jacket, but a little small for me. I need a medium, so this never got much wear. There seems to being be a small white mark on the back of the right shoulder. Looks like it is just dust and would wipe off. Here are the product details. According to Baracuta’s website this is the equivalent of a men’s size small •  Navy cotton-blend •  Funnel neck, buttoned throat latch and two front flap pockets, ribbed trims, internal pocket, fully lined •  Two-way zip fastening •  50% cotton, 50% polyester; lining1: 80% cotton, 20% polyester; lining2: 100% polyester •  Machine wash