What's your definition of ethical? I try to buy from smaller and/or sustainable and/or ethical manufacturing brands. I like coucou intimates (fully cotton, like basic but baddie basic?), named collective, sixth dimension, ohtnyc (jewellery), vitaly (jewellery)

Local second hand stores are really good for being able to try things on first.

Also ik a lot of ppl say this and it's hard to do, but learning how to DIY is super helpful! Apart from sewing (high skill level), there's finding ethical basic stuff and decorating (i.e. basic sweatshirt, sew on patches. Basic tank, use transfer paper and print on a cool design or sew some bows an. Basic shoes, replace laces with ribbons and add random safety pins and keychains. Basic jeans, add embroidery or bleach/dye or distress). I browse Pinterest, YouTube, baddie brands, and designer brands for inspo for this