Billie Eilish Costume
Rock the ultimate oversized streetwear look with signature neon green roots.
Billie Eilish is famous for her genre-defining music and her signature oversized streetwear aesthetic. This costume is a popular choice because it is incredibly comfortable, instantly recognizable, and easy to put together. The look features baggy neon garments, chunky sneakers, layered silver chains, and her iconic black hair with bright green roots.
- Difficulty
- Easy
- Time
- ~20 min
- Budget
- $30–80
Try it on
See yourself as Billie Eilish
One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.
One render, $1. No account needed — if it fails you're not charged. Pricing.
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What you need for a Billie Eilish costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Billie Eilish costume — one box instead of 6 pieces.
Oversized neon green t-shirt
An ultra-baggy, bright neon green t-shirt, preferably sized up two to three times.
DIY: Buy a plain, extra-large neon green t-shirt and draw a simple black stick-figure logo on the front with a fabric marker.
Matching neon green shorts
Loose-fitting, long neon green mesh or cotton shorts that reach the knees.
DIY: Use any oversized black or neon green sweatpants or basketball shorts you already own.
Black and neon green wig
A shoulder-length black wig featuring bright neon green roots and a middle part.
DIY: Part your own dark hair in the middle and apply temporary neon green hair spray or chalk to your roots.
Chunky silver chain necklaces
Multiple layered silver-colored chains of varying thicknesses, including a choker style.
DIY: Layer any silver jewelry, heavy keychains, or metallic chains you have at home.
Chunky white sneakers
Thick-soled, retro-style white platform sneakers.
DIY: Wear any bulky white athletic shoes or high-top sneakers.
White crew socks
Classic white athletic crew socks pulled up to mid-calf.
Rather not assemble it? See ready-made Billie Eilish costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the oversized neon green t-shirt and matching baggy shorts.
- 2
Pull on the white crew socks and adjust them so they sit straight on your calves.
- 3
Lace up your chunky white sneakers.
- 4
Put on the black wig with neon green roots, ensuring the middle part is straight and visible.
- 5
Layer the chunky silver chain necklaces around your neck, placing the shortest chain first.
- 6
Add optional chunky silver rings to your fingers to complete the accessorized look.
Makeup & hair
Wear a black wig with bright neon green roots styled in loose waves or space buns. Keep your makeup minimal with groomed eyebrows, clean skin, a neutral lip, and a relaxed, sleepy-eyed expression.
Billie Eilish for couples, groups, kids & more
- couples
- Pair up with someone dressed as her brother and producer, Finneas, wearing a sleek designer suit or casual streetwear.
- group
- Have friends dress as different eras of Billie, such as the 'Ocean Eyes' silver-blue hair look, the 'Happier Than Ever' blonde look, and the classic neon green era.
- kids
- Use a kids' size oversized bright yellow or green matching sweatset and temporary green hair spray.
- Plus size
- This oversized, baggy style is naturally comfortable and highly accommodating; simply size up two or three times in standard streetwear.
- pet
- Dress your dog in a tiny neon green dog hoodie and a lightweight silver plastic chain.
Tips
- Buy clothing that is two to three sizes larger than your usual size to achieve the authentic, ultra-baggy silhouette.
- If you do not want to buy a wig, use temporary green hair chalk or spray on your real roots while keeping the rest of your hair dark.
- Keep your posture relaxed and slouch slightly in photos to capture her signature laid-back attitude.
Billie Eilish costume FAQ
- What is Billie Eilish's most iconic costume look?
- Her most famous look is the matching oversized neon green and black outfit paired with her signature black hair and neon green roots.
- How do I get Billie Eilish's hair without a wig?
- Part your hair in the middle, tie it back, and apply temporary neon green hair spray or chalk directly to your roots, leaving the rest of your hair dark.
- What accessories do I need for a Billie Eilish costume?
- You will need multiple layered chunky silver chain necklaces, silver rings, and a pair of thick, chunky sneakers.
Did you know? Billie Eilish's signature oversized clothing style was originally a deliberate choice to prevent people from body-shaming or sexualizing her in the media.