black polyester dress Sasha Ruched Maxi Dress, Cowl Neck lined bodice and open criss Black A-Line Belted Midi Dress

A cocktail dress that is perfect for a summer garden gala may look completely out of place at a winter black tie ball

The site has an expansive collection of dresses (we're talking over 1,000), and it's easy to filter by price, color, sleeve length and more

Tailored silhouette with clean, structured lines

Since New Year's Eve (aka one of the best excuses in 365 days to get all gussied up) is right around the corner, we asked some of the uber-stylish users on Polyvore to share a few of their favorite party outfit ideas this week

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