Sarah Jessica Parker 's Wednesday night outfit may have had wings, but she certainly wasn't soaring in it ... she almost came crashing down to earth when her heels caught in the skirt of the dress.

The actress stepped out in NYC at an event with her husband, Matthew Broderick ... putting a dark twist on an otherwise angelic look with a pair of floor-length feathered wings strapped to her back. TMZ.com

She stepped out of her SUV looking sexy and serene, like any dark angel would ... though the veneer fell away when she took a few clumsy steps that'd give Bambi a run for his money.

Check it out ... the skirt keeps tangling around SJP's feet -- making it darn near impossible to walk. She poses for a few photos, but quickly grabs Broderick's arm before he gets too far away from her

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