Piping
Contrasting trim can add a cool retro feel to a simple dress. But it also can turn a piece into artwork. Just look at that ethereal creation at Marc Jacobs! It looked as if the designer outlined the dress with a pencil right before the model walked out on the runway.

(clockwise from top left) Twinkle by Wenlan, Badgley Mischka, Bibhu Mohapatra, Marc Jacobs, BCBG, Douglas Hannant

Photo credit: Style.com, Getty