Style-wise it’s Brandy Melville, although I’ve never actually been to one of their physical stores. ModCloth is a very mixed bag, but they have some great stuff as well. And, despite not having the best reputation, Hollister and Abercrombie make some stylish clothes as well (but get them on sale).
depop, and when i can afford it, everlane and andotherstories! i also like uniqlo for basics, but don't regularly shop there bc my existing uniqlo basics are holding up v well