The sexiest new shirtdress borrows its style from the boys. Blake Lively hit the sidewalk in a menswear-inspired Rag & Bone tunic perfectly accessorized with, well, Penn Badgley. For your next brunch date—with or without a Gossip Girl hunk—add a pair of barely-there flat sandals to a simple cotton shift for just-rolled-out-of-bed appeal.

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