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Credit: Johns PKI / Splash News September 2014 The actress took a stand for ladies (and feminist gents!) everywhere when she launched her HeForShe campaign at the United Nations in NYC

This will be a great party dress any time of the year

Keep the Venue in Mind Photo Credit // Zola Black tie can mean different things at different places

The socialite and businesswoman,28, captioned her post "thierry mugler 99'," spotlighting a vintage design from the legendary French couturier

A small necklace around the neckline works too, or a scarf if you prefer, depending on the season

At Buzzfeed, writer Claudia Koerner called a lighting expert friend, who had a pretty interesting explanation: After a minor freak-out (because I somehow saw it both ways at different times), I asked my friend Ben, a post production supervisor in Los Angeles, to weigh in