When I got into high fashion, I became really aware of how fast fashion is so excessive and cheap. Don't expect people around you to be nearly as conscious about it as you are. It's basically ingrained into society that if you spend more than $20 on a t-shirt or blue jeans that you're ironically the wasteful one. They will absolutely shame you over making an expensive purchase that are more ethical for the environment, factories involved, and industry.
If you're worried about the environment in particular, look into organic clothing or simple reputable labels that are open about factory conditions and how they're made. Clothing is notorious for being one of the most "dirty" industries, with how toxic dyes are, bleaches, and awful factory conditions. Look into silk worm farms if you want to be angry.
You need to run far away from common brands if you want to get away from things like that. Pretty much, if it's in an average mall, it's likely guilty of all of thee above unless they explicitly state otherwise. Some may state "we got good factory conditions" but that doesn't matter if the factories are polluting the environment. You're just going to have to pay more for very ethical clothing and can't deceive yourself into thinking something like H&M is good just because it's made in Europe. Fast fashion is basically a detriment to fashion as a whole.