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Petal + Pup: For trendy summer styles that won't break the bank, Petal + Pup is our go-to

A sweater dress such as the Loft Ribbed Turtleneck Ribbed Midi Dress in Pavestone Heather ($100, loft.com) is fine on its own but gets extra cozy layered over Everlane's The Long-Sleeve Supima Square-Neck Bodysuit in Black ($32, everlane.com) and under the trim Old Navy Cozy Long-Line Cardigan Sweater for Women in Heather Gray or Black Jack ($48, oldnavy.gap.com)

A Georgian-style dress designed by theatrical designer Oliver Messell and worn by Princess Margaret to a ball in 1964 is also on display

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