Sam Smith was all about bringing extra to the "Barbie" movie premiere across the pond ... as in, lots of extra material to complete their look.
The singer showed up to Wednesday's European premier in London rocking a crewneck with 16 XL written across the front. Unclear if that's the actual size of the gear, but it's a BIG fashion statement nonetheless.
Sam's not in the movie, instead they're singing on the "Barbie" soundtrack ... with a song called "Man I Am," dropping next week, at the same time the Greta Gerwig film hits cinemas back here in the States.
Margot Robbie and Ryan Gosling, meanwhile, were on the other end of the fashion spectrum ... Ryan went with a mint green suit, and Margot wore pink once again, as she has throughout her movie promotion.