If you're the kind of gal who thinks black will always be the new black, then this is your time because the Wickedly Witchy trend is a total priority this season. Meet the new lace dress guaranteed to bring instant cool to your hot-weather style. See how Givenchy shut it down on the SS16 catwalk, blogger Chiara Ferragni bossed it for festival season and how you can start your own lace race…