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Ambiguous shape illusions differ from The Dress in one fundamental aspect, however: whereas observers can usually flip their perception from vase to faces with little trouble, people often appear stuck in either the white-and-gold or the blue-and-black camp

1 Traditional Witch Costume Woman's Day 2 Basic Witch Costume Maksym Belchenko Images It doesn't get any easier than this basic witch's getup, which only requires a simple black dress and a witch's hat

Made from glitter tulle with delicate lace appliques, this mini dress features an off-shoulder illusion sweetheart bodice with short sleeves for a romantic touch

And as long as they match the formality of your attire and are comfortable enough to wear all night, the style is up to you