Gucci reversible trench coat authentic

I believe this coat is from the 90’s as in runway pic but i could be wrong One side is matte black and the other side has a sheen to it. One button is missing which is not very noticeable. Only effects one side There seems to be stitching that was not original to coat near the midline of coat- but again this is not very noticeable. Faint mark on one area above pocket as pictured- not very noticeable Size 42. Ive attached a size guide. Im a womens 6/8 medium in most things this is big on me in both chest and arms. I would say this leans more towards a womens large/XL and mens small