Black Gap winter coat with detachable hood size small

This is a black gap winter coat that is pre-owned, with barely any signs of wear. There is a small white stain on inner left side of the jacket but it’s entirely invisible on the outside of the jacket ! I’m unsure if it is a small in men’s or women’s, but I presume it is a small in men’s. Please refer to measurements ! 100% polyester collar to bottom 21 ½” | sleeve 32” | waist 23” | chest 23” Size Guide: Collar to Bottom: Back of garment collar (bottom stitching) to the very bottom of garment Sleeve: Center Back of bottom of collar, to end of sleeve) Waist (of shirt): Horizontal length of the most narrow part of shirt Chest: Horizontal Measurement of under armpit seam to under armpit seam