Life at Cloverhill

Costume Craft Tutorial DIY Halloween

How to Make a Rumi Costume from KPop Demon Hunters (DIY Tutorial)

Looking to dress up as Rumi from Kpop Demon Hunters this Halloween? You’re not alone! In this step-by-step guide, I’ll show you how to make your own DIY Rumi Halloween costume, complete with her signature details and K-pop flair. Perfect for a kid or adult Halloween costume!

If you’ve seen Kpop Demon Hunters, you know the opening airplane scene steals the show. When the Huntrix band performs their hit song “How It’s Done,” Rumi takes the spotlight with her bright yellow jacket, bold purple braid, and unbeatable confidence. It’s one of the most iconic looks from the movie — energetic, stylish, and totally DIY-able for Halloween or cosplay.

In this post, I’ll walk you through how to make your own Rumi costume inspired by that exact performance. From crafting her signature yellow jacket and customizing the patches, to styling the purple braid and adding all the right accessories, you can recreate Rumi’s look with some things you might already have in your closet, a few craft supplies and a creative touch.

Whether you’re a Kpop Demon Hunters superfan or just looking for a fun, music-inspired costume idea, this DIY Rumi outfit tutorial will help you bring the K-pop stage magic to life — right in time for Halloween.

Planning a group costume? Pair Rumi’s look with my DIY Mira costume from Kpop Demon Hunters for the ultimate K-pop duo! Both outfits are inspired by the “How It’s Done” performance and look amazing together — perfect for siblings or best friends who love the movie.

Table of Contents

  1. Making Rumi’s Unique Yellow Jacket
  2. Adding Custom Badges to Rumi’s Yellow Jacket
  3. Creating Rumi’s Iconic Purple Braid Extension
  4. Embellishing Rumi’s Shorts and Boots
  5. Finishing Touches: Rumi’s Accessories

Making Rumi’s Unique Yellow Jacket

Image from “KPop Demon Hunters”

In the opening number “How It’s Done”, Rumi’s wears a bold yellow jacket. You could look for a thrifted yellow bomber jacket, find one online, or make a yellow polar fleece bomber jacket like I did!

Using this Kwik Sew “Sewing for Children” pattern book from the 90’s (Thanks Mom!), I was able to make a custom yellow bomber jacket using yellow polar fleece and black ribbing.

My mom was a big help in putting this jacket together. She came over late one night with her serger (similar machine) and we were able to get the rough draft of the jacket made up, before adding the ribbing collar, zipper and all the badges.

Materials Used:

Pattern BookAmazon CanadaAmazon US
Yellow Polar FleeceAmazon CanadaAmazon US
Black RibbingAmazon CanadaAmazon US
Black ZipperAmazon CanadaAmazon US
Serger Sewing MachineAmazon CanadaAmazon US
Yellow Serger ThreadAmazon CanadaAmazon US
Regular Sewing MachineAmazon CanadaAmazon US
Yellow Sewing Machine ThreadAmazon CanadaAmazon US

Adding Custom Badges to Rumi’s Yellow Jacket

Did you know you can make your own badges just like those on Rumi’s yellow jacket?

I found a great Etsy store that has the Rumi Badge Designs (along with Mira’s t-shirt design!). Using some simple materials, along with Iron-On Transfer Paper for Dark Fabric, I was able to recreate the designs from the movie.

I suggest printing the designs on printer paper first and pinning them to the jacket, to double check the sizing.

Steps to Make Rumi’s Badges

1. Print the designs on Iron-On Transfer Paper for Dark Fabric, as per the package instructions. Cut out designs using good scissors. For more difficult pieces, use a utility craft knife.

2. Heat iron on the hottest setting, without any steam. *make sure there is no water in your iron before starting*

3. On a solid surface (not an ironing board), press yellow cotton fabric to remove any wrinkles. Iron on Heat n’ Bond Fusible Interface to the back of your fabric, as per the package instructions

4. Flip fabric over. Peel the backing off the badge designs and arrange on the good side of the yellow fabric. You may need to use tweezers to get the backing off of your design.

5. Cover the design with the teflon paper included in the iron transfer package. Iron the design onto the fabric, using heavy and even pressure, following the package instructions.

For these designs, I ironed for about 2 minutes on the highest heat setting, moving all around the covered part of my design. Then I repeated it on the next area of the badges. Remove teflon sheet and voila! Your design is done!

6. Using a Satin Stitch (or a very tight Zig Zag Stitch) on your sewing machine, stitch around the border of each badge in either yellow or black (depending on the design) Cut out finished badges with fabric scissors, being careful not to nick the stitches.

7. Sew Badges to your jacket, using a sewing machine, hand stitching or using fabric glue (depending on jacket fabric).

Materials Used:

Yellow Cotton FabricAmazon CanadaAmazon US
Heat n’ Bond Fusible InterfaceAmazon CanadaAmazon US
Iron on Transfer Paper for Dark FabricAmazon CanadaAmazon US
Rumi Jacket Badge ImagesEtsy
Yellow Sewing ThreadAmazon CanadaAmazon US
Fabric ScissorsAmazon CanadaAmazon US
Utility Craft KnifeAmazon CanadaAmazon US
Black Sewing ThreadAmazon CanadaAmazon US
Sewing MachineAmazon CanadaAmazon US

Creating Rumi’s Iconic Purple Braid Extension

One of Rumi’s most eye-catching features is her long purple braid. You can use a combination of temporary purple hair wax and purple hair extensions to create a voluminous braid that can be used again and again!

You can make a reusable Rumi Braid using a Dragon Braid Method. I’ll be sharing a video on how I did this braid, later this week!

To style your hair to make it easier to add the Purple Braid, you’ll make almost a bubble braid down your natural hair:

  1. Take a section at the front of your head and tie the hair into a small ponytail.
  2. Clip the ponytail out of the way.
  3. Take a new section of hair below the first one and tie the hair into a ponytail
  4. Take down the first ponytail and tie it together with the second ponytail
  5. Repeat steps 3 & 4 until there is no more hair to add to the ponytails
  6. When there is no more hair to add to the braid, go about an inch down the hair and add a hair elastic
  7. Repeat until you reach the end of the hair

Apply purple hair wax to the finished sections. The wax will also act as a gel to help with flyaways.

Pin the Purple Braid to the first ponytail section you made on your natural hair. continue to pin the braid to each ponytail section going down. You can use extra clear elastics to help attach the purple braid to your natural hair ponytail end.

Materials Used:

Purple Hair Faux Hair ExtensionsAmazon CanadaAmazon US
Purple Hair WaxAmazon CanadaAmazon US
Hair Braiding Kit with Clear ElasticsAmazon CanadaAmazon US

Embellishing Rumi’s Shorts and Boots

Image from “KPop Demon Hunters“

Rumi wears dark, high-waisted shorts that have dark pink stripes up the sides and along the waistline. You can easily recreate this trendy look using denim shorts with dark pink craft felt.

Cut strips of dark pink craft felt using a rotary cutter, quilting ruler and cutting mat, or fabric scissors.

Using a sewing machine or hand stitching, apply the felt stripes to the waistband and sides of the shorts. I also added faux “belt loops” to the front of the shorts. Alternatively, you could use hot glue.

Add a Purple Korean Norigae or Chinese Knot to one side of the shorts.

Materials Used:

Jean ShortsAmazon CanadaAmazon US
Dark Pink Craft FeltAmazon CanadaAmazon US
Dark Pink Sewing ThreadAmazon CanadaAmazon US
Sewing NeedlesAmazon CanadaAmazon US
Rotary CutterAmazon CanadaAmazon US
Quilter’s RulerAmazon CanadaAmazon US
Cutting MatAmazon CanadaAmazon US
Hot Glue GunAmazon CanadaAmazon US
Hot Glue SticksAmazon CanadaAmazon US
Purple Korean Norigae / Chinese KnotAmazon CanadaAmazon US

Finishing Touches: Rumi’s Accessories

Complete your KPop Demon Hunters costume with Rumi’s must-have accessories: silver chain necklace, hoop earrings, face gems, white turtleneck and tall boots. We added nude tights to keep warm while trick-or-treating in our colder climate.

Don’t forget a confident pose — Rumi’s power comes from her attitude as much as her outfit!

Girls White Turtleneck ShirtAmazon CanadaAmazon US
Nude Coloured TightsAmazon CanadaAmazon US
Silver Chain NecklaceAmazon CanadaAmazon US
Hoop EarringsAmazon CanadaAmazon US
Girls Tall BootsAmazon CanadaAmazon US
Face GemsAmazon CanadaAmazon US
MascaraAmazon CanadaAmazon US
Eyeshadow PaletteAmazon CanadaAmazon US

And there you have it — your very own Rumi costume inspired by the Huntrix band’s “How It’s Done” song in Kpop Demon Hunters! With a little creativity and attention to detail, you can bring Rumi’s bold stage look to life — complete with her yellow jacket, purple braid, and confident, ready-to-shine energy.

Whether you’re hitting a Halloween party or a cosplay event, this DIY project is all about fun, flair, and a touch of demon-hunting attitude. So cue up “How It’s Done,” grab your glue gun, and get ready to channel your inner Rumi — you’ve got this!

If you loved making Rumi’s outfit, be sure to check out my DIY Mira costume tutorial from Kpop Demon Hunters! Mira’s cropped t-shirt, bright yellow skirt, pink hair and rockstar accessories, make her another fan-favorite. It’s the perfect companion costume if you’re planning a KPop group or best-friend Halloween look.