Popsugar Fashion Summer Fashion 2-in-1 Dress Trend It Won’t Be Long Before Every It Girl Is Wearing the 2-in-1 Dress Trend June 3, 2017 by Marina Liao View On One Page Photo 2 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Sienna Miller Rocked This Lanvin Dress to London's Premiere of Live by Night Previous Next Start Slideshow Summer FashionSpring FashionFashion TrendsRunwaySpringDressesStyle How-To