Check out the subreddits /r/FashionReps and /r/DesignerReps for more info. Lots of trusted (by their definition) clothing/bags/shoes sellers are there but the process is completely difference. Very few sellers maintain websites like the watch rep world, where it is much easier to buy from TDs. You will need to learn how to use WeChat and get a buyer's agent (e.g., WeGoBuy -- although they are not shipping rep packs right now due to the coronavirus), which will purchase from a seller's TaoBao or Weidian site (these are kinda like China's version of Amazon). It can get very pricey quickly and if you're spending 75% of a gen on a rep, many would ask if that is worth the hassle. Also remember with shoes that even though they may look the same, the sole material and composition may be different. Improper internal support can cause foot, leg, knee, and back pain.
If you do go this route, especially with sneakers, the embroidery is usually terrible on the cheaper reps (just like here, you get what you pay for) and they try to hide this by forgetting to send QC pics altogether or not including anything up close. Go hang around those subreddits for a while to get a better feel.