In these uncertain times, you couldn’t ask for a better set of data points than the retail results coming this week. You have struggling legacy brands (Gap) and new ones on the rise (On). There are tech platforms coming off a major victory (Farfetch) and struggling to win back investors’ confidence (ThredUp). There’s also the two biggest American department stores (Kohl’s, Macy’s), big-box retailers (Target, Walmart) and off-price…