As the most formal dress code there is, there's no "white tie casual" option like there is with business attire. For people who prefer feminine clothing, opt for a floor-length gown and ornate jewelry (via Brides.) Any ankle-grazing dress will not do; the cut and design of it must be elegant, using refined fabrics such as damask or chiffon. Though not required, you can also choose to wear long white gloves.
If you prefer masculine clothing, you're going to need more than your standard suit and tie. Rather than a sports jacket, wear a black evening tailcoat, accompanied by a matching high-waisted trouser with a single satin stripe or braid on the side — or two if you're in the U.K., according to GQ UK. The suit must be worn with a bow tie, vest, and wing-collared shirt, all white. Cufflinks are required, with shiny studs replacing gaudy buttons. Finishing off this dapper look are black patent shoes worn with black dress socks.
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