If you want to be dressed to kill, first you need to be dressed with skill. Enter: Stylist Karla Welch, who is the mastermind behind many memorable celebrity fashion moments. Remember when Tracee Ellis Ross commanded the 2018 Emmys with her larger-than-life pink Valentino gown or how Hailey Bieber shut down the 2022 Met Gala with a luxurious white slip …