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"The biggest difference between black-tie and black-tie-optional attire is simply choice," says Jason Jackson, president and COO of Generation Tux

Supported further here by your slightly more formal, but no less cool brown linen suit and black cordovan combination Cheers CK

Strappy Asymmetric Lace Trim Mini Dress In Black Satin $11.00 (70% OFF) $37.00 Colour:black Details Meet the black lace satin mini dress, a sultry, strappy asymmetric piece with delicate lace trim and glossy satin finish that's built for edge and elegance

If the dress code is black-tie optional, consider it the hosts way of giving you some flexibility: Tux still at the cleaners