I think tights or leggings could be like the multisex clothing poster child, they fit pretty much everyone regardless of size, sex and shape.
Of course I don't really agree with this whole idea of people walking round with nothing on their bottom halfs except tights. People try to make it ok by saying they are wearing leggings but really they are no more acceptable than just tights on their own - there is not much of a line between footless tights and leggings.