This post may contain affiliate links, which means I may earn a commission if you decide to make a purchase through our links, at no cost to you. You may view the disclosure here.
Are you ready to take this Halloween by storm with your sister?
If yes, it’s time to get ready for a night of double trouble!
Continue reading to find the best and most creative sister Halloween costumes for adults.
These Halloween costume ideas for two sisters include DIY witch costumes, iconic duo costume ideas for adults, and cute sister costumes for Halloween.
So grab your sis, let your creativity soar, and get ready to turn heads at any spooky soirée with these jaw-dropping sister Halloween costumes for adults!
Best Sister Halloween Costumes for Adults You’ll Love
These Halloween costume ideas for two grown-up sisters include cute, scary, and sexy costumes!
Want an easy Halloween costume for two sisters who are adults? Simply dress up as two witches! You can wear matching black dresses, and witch hats, and carry broomsticks.
Dress Up as Two Witches with Your Sis
2. Rapunzel and Cinderella
If you love Disney and fairy tales, then dress up as Rapunzel and Cinderella for Halloween!
Get Fairytale Costumes for 2 Adult Sisters
Love all things gothic? A fun and creative Halloween costume idea for two adult sisters is to dress up as vampires.
Etsy has GREAT vampire costumes for adults. You can also shop for black dresses, capes, fangs, and fake blood on Amazon.
Dress Up as Two Vampires with Your Sis
4. Disney Princesses
There are so many Disney princess costumes for adults, like Cinderella and Belle…the options are endless! For cute sister Halloween costumes for adults, dress up as your two favorite Disney princesses.
Halloween Princess Costumes for Two Adult Sisters
5. 1920s Flappers
Amazon has so many flapper dresses for adults, including plus size flapper dresses. For DIY sister Halloween costumes for adults, embrace the Roaring 20s and dress up as two flappers!
Flappers Sister Halloween Costumes for Adults
6. Alice and the Queen of Hearts from Alice in Wonderland
You will LOVE this Alice in Wonderland costume for adults and this Queen of Hearts costume too! Amazon has sexy versions of these Halloween costumes for two sisters as well.
Get these Halloween Costumes for Two Sisters
If you love Disney costumes for siblings, dressing up as Alice and the Queen of Hearts is a great idea!
If you want DIY sister Halloween costumes for adults, dress up as two zombies. You can get creative with pale makeup and fake blood. For easy costumes for two sisters, you can buy zombie costumes on Amazon.
Elevate Your Halloween Game with These Adult Sister Costumes
Usually, you think of dressing up as Ghostbusters for groups of 3, but you don’t have to!
Get This Perfect Halloween Attire for Adult Sisters
9. Wonder Woman and Supergirl
If you love superheroes, you can dress up as Wonder Woman and Supergirl for Halloween for your sister!
Unleash Your Sisterhood Spirit with These Adult Halloween Costumes
For last-minute sister Halloween costumes for adults, you can dress up as two pirates. Amazon has lots of pirate costumes for women to choose from.
Get Ready to Turn Heads with These Adult Sister Halloween Costumes
11. The Sanderson Sisters
If you have two sisters, then you can dress up as the three Sanderson sisters for Halloween as adults!
Take Your Halloween Celebrations to the Next Level with These Sister Costumes for Adults
12. Mike Wazowski and Sulley from Monster’s Inc.
If you want to stay warm on Halloween night, dress up as Mike Wazowski and Sulley from Monster’s Inc. for cute sister Halloween costumes for adults.
Double the Fun: Get These Adult Sister Halloween Costumes
13. Poison Ivy and Harley Quinn
If you love DC Comics, then you can’t get better Halloween costumes for two adult sisters than the Poison Ivy sexy costume and the sexy Harley Quinn costume for adults.
No one will mess with you and your sister if you dress up as Poison Ivy and Harley Quinn on Halloween night!
Get These DC Comics Costumes for 2 Sisters
There are so many Catwoman costumes to choose from. Whether you go with the classic Julie Newmar costume, the Michelle Pfeiffer Catwoman costume, or the Catwoman costume worn by Zoe Kravitz – you can dress up as two different versions of Catwoman for a creative costume idea!
Make a Statement Together with These Catwoman Adult Sister Halloween Costumes
15. Ringmaster and a Lion
For creative sister Halloween costumes for adults, why not dress up as characters from the circus?
Copy this Fun Adult Sister Halloween Costume Idea
16. Fire and Ice
For easy DIY Halloween costumes for two adult sisters, dress up as Fire and Ice! All you need are two t-shirts that say “fire” and “ice.”
Get These DIY Costumes for Two Adult Sisters
17. Daphne and Velma from Scooby Doo!
Daphne and Velma are great sister Halloween costumes for adults because you have so many options!
You can make your own DIY Velma costume, your own DIY plus size Velma costume, or just buy the Velma costume on Amazon. Same thing for dressing up as Daphne!
Celebrate Sisterhood in Style with These Costumes
18. Zombie Nurses
Scare everyone around town on Halloween night dresses up as a zombie nurse with your sister!
Get These Scary Sister Halloween Costumes for Adults
19. Swat Team
Want sexy Halloween costumes for two adult sisters? Dress up as two SWAT team girls!
Dress Up as Swat Team Sisters!
20. Tinker Bell and Wendy from Peter Pan
If you want to dress up in a sexy Halloween costume and a cute Halloween costume as two sisters, then dressing up as Tinker Bell and Wendy is the perfect sister duo costume idea!
Get These Adult Sister Disney Costume Picks
21. Glenda and Dorothy from The Wizard of Oz
These adult Halloween costumes for two sisters are so sweet! If you have a dog, you can have him dress up as Toto too!
Get These Sister Wizard of Oz Costumes for Adults
22. Characters from The Purge
Want to dress up in scary sister Halloween costumes? If so, you can’t get much scarier than dressing up as characters from The Purge. All you need are The Purge face masks, white t-shirts, and fake blood. Yikes!!
Get These Scary Costumes for Two Sisters
23. 80s Workout Girls
Love all things neon? If yes, then why not dress up as 80s workout girls with your sister for Halloween? You can have fun wearing neon leotards, leggings, and leg warmers.
Dressing up as two workout girls is a great DIY costume idea for adults and sisters alike!
Get These DIY Adult Sister Costumes
24. Devil and Angel
These sexy and cute sister Halloween costumes for adults are perfect for last minute, DIY Halloween costumes.
Get these Devil and Angel Sister Costumes
Want cozy sister costumes for Halloween? Then dressing up in two onesies that look like skeletons is the perfect costume choice for you and your sister!
Get these Cozy Skeleton Costumes for 2 Adult Sisters
In conclusion, there are so many sister Halloween costume ideas for adults!
From wicked witches to enchanting Disney princesses, the options for sisterly duos are endless. Whether you prefer DIY creations or ready-made costumes, there's something for every dynamic sister pair. Get ready to take Halloween by storm, because when sisters team up, the fun never ends!