Vintage Classic Trench Coat

Vintage classic black trench style coat with beautiful buttons Feels/ looks like a raw silk however the label makes me think it’s a raincoat sooo I’m not sure if that would be raw silk 🤷‍♀️ Beautiful condition- does have two small whitish spots on the back side (shown in last two photos ) Fits mannequin great so should be a S please check measurements too (even tho tags says 10)