I would definitely recommend Forever 21. They have the best over sized sweaters and they carry a variety of styles like boho, posh, indie, etc. I know Reebok, though, has a version of those pink sneakers in the first photo. Charlotte Russe carries those black, flouncy, circle skirts that was shown in the first photo (I would know because I bought one identical to that there haha) and also those Jeffrey Campbell-type heels in the last photo. Pac Sun is great for denim and denim jackets, but again, so is Forever 21. I would also recommend Delia's because they carry Converse and also have supplied me with a fantastic denim moto jacket haha
eBay is the shit. Just find out what size you are in designer brands then buy clothes on sale via auction. Worst case scenario is that it's too big then you just get it altered by a seamstress for $20.