Chadwick Boseman wore custom Givenchy for the Oscars 2019. It was a suit with agate embroidery, inspired by a designfrom the Fall-Winter 2018 Haute Couture show–you can see it more in detail here: 01, 02 & 03.
During an interview with WWD, stylist Ashley Weston said that the suit “was a custom style that was both traditional […] took four seamstresses 500 hours to make—and modern. It felt so him. It had understated drama.”
To accessorize the look he wore Bulgari ’s B.zero1 white gold rings with diamonds and a Serpenti 18 kt white gold ring set with pavé diamonds.
Boseman was a guest since his movie Black Panther received a lot of nominations: Best Picture, Sound Editing, Sound Mixing, Production Design (which they won), Original Score (which they won), Original Song and Costume Design (which they won).