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Advertisement - Continue Reading Below 9 Catherine Deneuve, September 1966 Getty Images French actress Catherine Deneuve added a bit of flair to her simple black dress with a gold square belt and metal embellishments

Sai looked dapper in a traditional black tuxedo that was custom designed by Ascot & Chapels in London

The little black dress can go from office to evening wear with ease, which is why this one basic piece of clothing has withstood the test of time

I think that's what's happening in the dress illusion -- we are trying to allow for perceived lighting conditions in the photo -- so the actual illusion is in our guess as to what those light conditions actually are

Alison Deyette, style expert, suggests this checklist: First, you want to be sure the dress is not see through and the fabric is not thin