Photo by Devon Jarvis/Studio D.

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One and Done
Slip into a one-piece wonder for a layered look without the bulk. A collared style is perfect tucked into a skirt for work, while casual flowier options are best over jeans.

1. Simply Vera Vera Wang, $48;
2. $168;
3. Ivanka Trump, $89; Lord and Taylor stores
4. $55;