I remember this a bit differently? I thought she wore nondescript de-branded clothing specifically because she had a behavioral/neurological/information processing/sensory overload condition that caused her to have tics and flip out in the presence of excessive visual input. I remember her intentionally choosing this clothing, as it jumped out at me. And I thought she wore Levi’s, not that it matters, though they do have minimal brand motifs compared to some brands.

I didn’t finish the book, and it has been a while, so I could well be mistaken or outright wrong. I don’t remember TH being mentioned specifically.