Summer Dresses LEAD
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Sundresses are the unofficial uniform of summer. Here, a go-to guide of the six styles that will help you make an entrance at every soirée on your calendar.

Barbecue Bound

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A light cotton dress is always a must, but the color blocking makes it ever-so modern.

Cos, $115;

Graduation Party

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Stay classy, but cool at your kid brother's big fête in a sleeveless, floral-print shirtdress.

Derek Lam 10 Crosby, $495;

Brunch al Fresco

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Go for a retro look in a pleated, trapeze number.

M Missoni, $465;

Outdoor Concert

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This lemon, off-the-shoulder mini dress is street-style ready.

Pixie Market, $62;

Date by the Sea

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A bandeau silhouette shows off the sundress's sexier side.

Raey, $562;

Beach Bonanza

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Every girl needs a halter style in her summer wardrobe.

Tory Burch, $225;