Here is a full list of cosmetics from the Fortnite Part of the Billie Eilish set. Set! It features a total of 7 Cosmetics that is broken up into 1 Outfit (Red Roots Billie), 1 Emote (you should see me in a crown), 2 Back Blings (Shark, Good Girl Wings), 1 Guitar (Red Guitar), 1 Drums (Flaming Hi-Hats), 1 Jam Track (bad guy).
