What follows is evidence that DC is so pretty, as well as that travelling with bright pieces can be a great alternative to sticking with neutrals.
Marni for H&M jacket, Mango mesh cutout tee, J Crew Minnie pants, Ferragamo My Joy ballerina flats, Hermes bag and bracelets, Ray Ban special edition wayfarers, Michael Kors watch
Karen Walker for Anthropologie Dolly Chambray Dress, J Crew necklace (sim), Red Valentino sandals (on sale here, here and here)
Lilly Pulitzer Jacqueline shift dress (sim)
Colour or print-mixing is generally an exercise in experimentation. My only advice - keep one item colour-free. My neutral footwear that weekend hopefully prevented me from looking as if a rainbow threw up on me.