After some thought, she said it's most likely because she will be looked down upon by other females if she is seen wearing something that she has previously been known to wear. I asked why again, and she said that sort of judgement has probably been inculcated in the majority of females; she clarified that she only bought new dresses so as not to be thought of as low status, and has no qualms wearing the same things around family.

Wow, I (a man) never had the slightest inkling that this pressure existed.