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Yoga pants, and those little belly shirts that show off their beer gut.
I would prefer that they wear no clothing items, Whoa!!!
Nose rings are out - but those are merely accessories - so I'll come right out and say that loin cloths are not flattering to middle aged women. They're certainly a fashion faux pas.
I don't think age should be the deciding factor. I've seen younger women of various ages that shouldn't have stepped foot out of their houses with what they were wearing such as tube tops or a midriff top with their big belly sticking out. One of the pictures I've uploaded is Kris Jenner who is 60 years old. The other is Courtney Cox and she's 51.
SPANDEX! And there are a lot of young women and girls who shouldn't wear it either.
Oh lots. That depends on what the middle aged woman looks like mostly.