Billie Eilish took the stage at the 67th Annual Grammy Awards for a performance dressed in an outfit from Martine ... "Birds of a Feather" wearing a yellow jersey from the clothing brand's Autumn ...

Billie Eilish wore Marilyn Monroe-coded lingerie in her Your Turn fragrance campaign, including a chemise, slip, and lacy shorts.

Billie Eilish performed her smash hit ... which was recently ravaged by wildfires. For her set, Eilish wore an oversized yellow jersey, baggy jeans, a long Mikimoto pearl strand necklace ...