I have to hand it to that eBay seller for coming up with a clever way to sell clothes. I can't imagine the quality is going to be very good, though, considering the price. You can pay $65 for just decent clothing item. It may be that she's using this as a way of unloading odd used things she that wouldn't sell otherwise. Size would be the main problem. I've bought a number of clothing things on eBay and easily half of them were unwearable due to size issues. A whole box of stuff? I dunno.
At your height and weight, you're going to have to shop carefully, Josefa. If at all possible, you should try and shop at a walk in store, not online. You might go to a couple of second hand/thrift-type stores at first. In addition to being low priced, you can find an enormous variety of things in those places and try on a lot of sizes and styles (all be it, all out of style). Later, you'll can shop more confidently in regular stores.