If you want to look fresh, try raiding your father's closet. "Dad shoes" -- those thick-soled, aggressively awkward sneakers beloved by Jerry Seinfeld, circa 1994 -- are currently fashion's hottest, must-have accessory. And celebrities can't get enough of them. Just this past month, Kim Kardashian, Kendall Jenner and Jaden Smith have all sported new clunky...