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15 Billie Eilish Halloween Costume Ideas For All You Bad Guys
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2018 Lollapalooza Billie

Like we said, lime green — otherwise known as slime green — is Billie's color. At 2018's Lollapalooza, she rocked a bright t-shirt with her name on it and a matching beanie.

What to wear: A green t-shirt and matching beanie with a pair of men's swim trunks as shorts.

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