Dress codes for events can often be unclear and stressful. For tomorrow night's UNICEF Snowflake Ball, take a cue from last year's celebrity attendees if you're still unsure about what to wear. While Uma Thurman kept it sleek and simple in an emerald calf-skimming number, Sarah Jessica Parker opted for full ostrich feathers in a Louis Vuitton ensemble. Take a look at these outfits from the 2011 UNICEF Snowflake Ball and maybe choosing an outfit for tomorrow (or any winter gala) will be a little easier. We'll see you at Cipriani's 42nd street!
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