Stitch Fix and ThredUp shares fall, as both companies navigate ambitious transitions

With clothing demand still muted, online styling service Stitch Fix Inc. on Monday said it was trying to become a more “fun” destination for customers, while online second-hand shop ThredUp Inc. has been trying to make a bigger push into consignment sales.But both companies said those ambitions would take time to realize, and their forecasts for the months ahead disappointed investors, in one way or another.In the process, Stitch Fix shares SFIX, +2.18%tumbled 14.7% after hours on Mo