What should a fat girl wear to the gym?

RedSmartie
So my friend (who is on the bigger side) and I went to our school's gym this morning to exercise before class. She had never been there before so I took her with me to show her around and help her exercise. She asked me what to wear and I told her that I usually just wear yoga pants and a t-shirt so we both went to the gym dressed like that.

It was fine at first but then some girls walked by and said (not very loudly but definitely loud enough that we could hear it), "that fat chick shouldn't be wearing those pants." I mean, under normal circumstances they'd be right but she changed into jeans after we left the gym so I don't see the problem with bigger people wearing yoga pants to the gym. At least they're going, right? What else is there to wear?
What should a fat girl wear to the gym?
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