This is just pricing in the cost of tariffs for the consumer. Rather than pay a fee at customs and be surprised that your $40 order is actually $120 after tariffs and fees a week after you placed it, they estimate it and try to pay it for you. This is because the items come directly from China, cutting out the need for a leech middleman to warehouse it and take profit off the top.

Similar price hikes are coming for the things you buy. Or even larger ones. This is not limited to Shein at all. There eill just be a delay while the warehouses sell out all of their inventory.