My wife and I also share lots of stuff. We're roughly the same size, although not proportioned the same, so sometimes we get each other's castoffs. Some stuff we buy two of, one each in our respective sizes. I don't have a separate stash of makeup, I just contribute into the common pool. Same with wigs, we each have a couple that only work for one of us, the rest we share. It is funny how different our personal styles are, when we see a garment or outfit in a shop, we usually speak in unison as to whether it's "hers" or "mine."
I'm just about as lucky as someone can be having such a perfect partner.