IF YOU FANCY a look into the razzmatazz-filled future of e-commerce, type #Sheinhaul into TikTok, suspend your ethical scruples, and watch young influencers tear open boxes of garments, yell things like “My Shein order is here…holy shit!”, and then pour hundreds of dollars-worth of cheap garments over their heads. It’s hype, for sure, but not entirely frivolous. Shein, a Chinese online retailer, is the TikTok of the $1.5trn apparel…