Anyone know where I can get those types of clothes that arent synthetic?

Okay so for context I don't want to support any main fast fashion site (Like Cider,Shein, Temu,etc) But I really want to have cute clothes like Himekaji, Shoujo, Coquette, Dollette (Lolita) etc. The thing is im not allowed to have anything that is polyester related (partially cuz I'm allergic to it and because I dont want it) but literally everything I see has polyester and not natural fibers [My mom doesn't like anything synthetic] But I don't know where to buy something that isn't like that :( There are no thrift stores by me and not any way for me to find clothes like those like. Does anyone know a website where I can order that is legit,has good quality and natural fibers? 😭I know its a lot too ask but I have hope that someone here knows at least a place