Just my opinion but I think you might have a difficult time getting someone who wears a size 44 or 46 to trade an original for a size 40 that doesn’t fit . I mean it’s basically the same reason that you don’t want to keep the jacket . Right ?It is unfortunately too small, it is a size 40 and I wear 44 or 46.
I think I will offer it for an exchange against another original jacket in my size.