There are plenty of platforms where you can resell clothes/shoes and other stuff. Everything depends on your strategy which you had built. If there is no such one, then you should think about sales channels. For example, you can try to launch this campaign in facebook. Of course, it's quite unsafe as we can notice, because facebook has recently became famous for leaking information, however it still remains as one of the most popular resell platforms. I believe that everything depends on your purposes. Don't forget about proper marketing campaign, because it matters a lot in this case. You should know how to promote your goods.