XNY/Star Max/GC Images/Getty ImagesYou don’t need a trip to Turks & Caicos to unleash your hottest summer alter ego. Vacation-ready style is entirely possible in whatever city you call home, without looking like you’re auditioning for The White Lotus. Meet the coastal city girl, the season’s coolest new fashion trend. And I do mean “coolest” in all the ways.I first encountered the aesthetic when Anne Hathaway stepped out in New York City earlier…