What was the theme of the Met Gala 2023? The dress code for the Met Gala in 2023 was "in honour of Karl." Andrew Bolton, the Costume Institute's Wendy Yu Chief Curator, examines the work of Karl Lagerfeld (1933–2019) in this exhibition. To honour the late fashion designer Karl Lagerfeld, many celebrities donned variations of the two hues for one of the year's most important fashion events.