It’s a cliche to say the stakes are high for a runway show, and rarely accurate. A brand can turn critical acclaim or a viral look into sales. But it’s rare for that buzz to last beyond fashion week. And in the age of mega brands and TikTok there are plenty of other ways to sell clothes and bags, even if the initial reception was negative. That said, there are three shows this week that could have a very real impact on some of the…