Can’t speak to girls clothes, or really even boys generally. But my kid couldn’t care less about clothes. He wears glorified pajamas- comfy sweats and hoodies. The only name brand thing is his Vans. He has two pairs of shoes: his ratty every day Vans and his special occasion Vans. I made him bring a pair of actual dress shoes, but I doubt he ever wears them.
This year is extra weird since they have had no reason to dress up. Normally the students have to wear nice clothes once a week. He has one go to pair of pants and shirt and jacket - and no, they don’t get laundered. He figures he only wears them for a couple of hours per week, so they never get dirty . I don’t think he is unusual in that philosophy.
I don’t doubt there are kids who care about brands and fashion and hygiene, but there are plenty who don’t.
Eta: I just read my post above that says he wears jeans. He does still have that one (!) pair of jeans, and when he’s feeling the need to take it up a notch, they come out of hiding. Much like with his mom, the pandemic dropped his standards down - I live in glorified pajamas too!