Best Bet: Motel Denim Playsuit

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When separates feel like too much effort in the heat, summer becomes the season of the onesie. Reminiscent of the all-denim looks from Stella McCartney's spring 2011 collection (which the designer herself has been seen sporting), Motel's Winnie denim playsuit looks like an easy choice for grab-and-go weekend wear. Details like the buttoned shoulders and V-neck open back make it a standout look on its own for day, though a bold accessory or two could make this an effortlessly chic outfit for a casual evening.

Motel Winnie Open Back Piping Detail Denim Playsuit, $72.40 online.