Porter’s tuxedo dress was designed by Christian Siriano. Jordan Strauss/AP Speaking to Vogue, Porter said that he wore the dress to challenge traditional ideals of men’s fashion ” My goal is to be a walking piece of political art every time I show up,” Porter told Vogue. “To challenge expectations.
https://www.insider.com/billy-porter-wore-tuxedo-dress-oscars-2019-2