You’re right, of course, that she’s reacting negatively. Do you have a quote describing her attire choices? I think the book does go into more detail on the nature of her condition(s) when it describes what she wears and why she chooses to dress thus.

Tommy Hilfiger clothing was considered kinda prep style, but got appropriated by street style and a lot of rappers would wear it in the 90s up til Tommy outed himself as a racist, by publicly saying that he didn’t want black people wearing his clothes, as he thought it brought down the value of the brand, or some such racist drivel.

That is to say, I am curious what style or aesthetic she’s recoiling against. To me, it seems like she’s vaguely working class attired, and recoils against professional costumes.