This homemade Halloween firefly costume combines common household supplies with a few simple store-bought items. It’s adaptable for kids or adults—and, yes, it glows.
For more ideas also see Halloween Costume Ideas With Garden & Nature Themes.
How to Make a Firefly Costume
Happy Halloween.
This DIY firefly costume is budget-friendly, comfortable, and fun to wear.
I wanted to keep it simple by using things I already had, with just a few inexpensive extras. My goal was to make something clearly recognizable as a firefly—without ruining any clothing or spending hours putting it together.
I’ll walk you through how I made each part of the costume, with optional variations depending on what you have on hand.
As always, I suggest checking your supplies first, borrowing if possible, or visiting thrift shops before buying anything new. I’ve also included links to online sources.
Main Parts
For this costume you will need:
- A black hat
- Bug antennae (often sold as “butterfly” antennae)
- Black, long-sleeve sweatshirt
- Black jeans or track pants
- Black shoes
- Bug wings (often sold as “fairy” wings)
- Clear fanny pack
- Glow sticks (I chose yellow)
- Optional: Extra bug arms (2) – black fabric, polyester stuffing
- Black embroidery thread
- Clear thread or fishing line
- Basic sewing kit
- Optional: Sewing machine, black felt, fabric glue, Velcro strips (hook and loop tape)
I’ve provided more tips and details below.
Hat & Antennae
The bug antennae are attached to a headband. I stitched the headband to a black winter hat with black embroidery thread to keep it extra secure. If your headband stays put on its own, there’s no need to sew it.
As a bonus idea, I considered adding some oversized firefly eyes to the hat. If that sounds fun to you, it’s something worth exploring.
Wings
I used wings similar to these ones from Amazon. They come with elastic shoulder straps, but they’re really sized for kids and not very comfortable on adults.
Instead of replacing the elastic with longer straps, I opted to attach the wings directly to our shirts using hook-and-loop (Velcro) strips at the shoulders. You can buy it in adhesive strips or by the roll, which is the most economical option.
The wings I bought were a single unit, so I started by cutting them into two separate pieces. Then I glued wide strips of black wool felt to the tops of each wing, and attached the Velcro to the felt and shirt shoulders.
Arms
Fireflies are actually beetles, which means they have six limbs. To make our costumes a bit more beetle-like, I added two extra bug arms to each costume.
I used scrap black fabric and polyester stuffing, but old black knee socks would work just as well. If you don’t sew, strong fabric glue can also hold the seams.
Each costume needs two extra arms, which requires four pieces of black fabric measuring 7×24 inches each.
To create the “hands,” I sewed small points at one end of each arm. They’re a bit fiddly to stuff, but the finished look is worth the effort.
To assemble:
- Place the fabric pieces right sides together and stitch around three sides, leaving the flat end open. A 1/4″ seam allowance is fine.
- Turn the arms right side out.
- Stuff with polyester filling. A blunt chopstick helps get stuffing into the “hands.”
- Don’t worry if they’re a little lopsided—wonkiness adds to the bug-like effect.
- Top-stitch each arm in two places to create segments (like real beetles have).
- Fold in the open ends and top-stitch to close.
To attach:
- Stitch the flat end of each bug arm to the side waist of the shirt—one on each side.
- To give the arms some lift, use clear thread to suspend them from the elbow area of the shirt.
Glow
Fireflies emit flashes of light from their abdomens to communicate—mainly for mating.
For the costume, I wanted to keep things comfortable (especially for sitting and driving), so I took a different approach.
I used yellow glow sticks tucked into a clear fanny pack to mimic the firefly glow. These particular glow sticks don’t flash, but they give off a nice steady light and are easy to use.
If your budget allows, you could also try small LED lights with battery packs, which can be set to blink on and off for a more realistic effect.
The glow sticks I used were labeled as lasting 12 hours, but in testing, they started to dim noticeably after 6 to 8 hours—which is still plenty of time for a Halloween party but bring extras if you want to keep glowing longer.
After Halloween, I will remove any stitching from the hats and shirts so they can be reused and save the other pieces for a new costume next year.
Firefly Puns
We came up with a few firefly puns if anyone asks about our costumes.
We can say:
- We’re the original flash mob.
- We’re lit, obviously.
- Just a couple of glow-getters.
- We’re glow mates for life.
- We’re in a long-term glowmance.
- We’re light years ahead.
- It was love at first light.
Happy Halloween.
~Melissa the Empress of Dirt ♛
