The 10 Best Sibling Halloween Costume Ideas

Snailify Kids Milk and Cookies Costume ($37)

Sibling relationships are often pretty complicated ones. Even if your kiddos aren't as sweet of a combo as milk and cookies, you can still pretend come Halloween with this hilarious sibling Halloween costume, which we'd argue is especially perfect for brothers and sisters.

Pottery Barn Kids Baby Disney's Winnie the Pooh Halloween Costume ($89, originally $99) and Pottery Barn Kids Baby Disney's Tigger Halloween Costume ($99)

It truly doesn't get any cuter than this Winnie the Pooh Halloween costume set. Your little ones can pretend they're part of the Hundred Acre Wood with these plush and ultra-cozy costumes. Dress one baby up as Winnie the Pooh and the other as everyone's favorite (and most energetic) fictional character, Tigger. You'll have no shortage of adorable Halloween photos.

Peanut Butter & Jelly Children's Halloween Costumes ($43)

These two coordinating sibling Halloween costumes go together like peanut butter and jelly — exactly like them, in fact. The set features two identical costumes that resemble slices of bread, one with a jelly spread on top, and the other with peanut butter (or sunbutter, for kids with allergies). The Halloween costume idea is funny, unique, and surprisingly comfortable, making it a great buy for older kids and tweens who might want to wear something more relaxed while trick-or-treating.

Matching Chick Costumes For Babies ($260)

If you've got a couple of newborn babies on your hands, what better way to memorialize their first Halloween than with matching chick costumes? They might not have hatched from an egg in quite the same way, but they've still got that wide-eyed spirit that's as endearing as an actual baby chicken. Plus, this hand-crocheted set is made with toddlers in mind and even features a cozy onesie as the base.

Fruit & Veggie Costumes 2 Slip-On Halloween Costume ($35)

Get this adult Halloween costume for the grown-up siblings who are still like two peas in a pod. It's perfect for the pair who love a cheesy pun. The identical costumes showcase their special bond even more.

"Hocus Pocus" Set ($29, originally $36)

Halloween costumes don't come any cuter than this, especially if you have multiple babes you're trying to coordinate outfits for this Halloween. The spooky set features three onesies in green, red, and pink, all of which are designed to look like the unforgettable costumes of the Sanderson Sisters from "Hocus Pocus."

Thing 1 and Thing 2 ($25)

Keeping up with your kids can feel like a chore in itself, especially if you have twins, triplets, or just growing youngsters who look a lot alike. Play into their resemblance with these Thing 1 and Thing 2 outfits, which are bound to inspire plenty of laughs while they're trick-or-treating around the neighborhood or partying it up at a Halloween get-together.

Pottery Barn Kids Disney and Pixar "Monsters, Inc." Sulley Costume ($129) and Pottery Barn Kids Disney and Pixar "Monsters, Inc." Mike Costume ($99, originally $129)

Celebrate the inimitable spirit of your little monsters and their wild energy with this sibling Halloween costume that pays homage to Mike and Sulley from Disney Pixar's "Monsters, Inc." The coordinating Halloween set is perfect for younger kids who are just watching (and falling in love with!) the classic film for the first time.

Rock-and-Roll Matching Halloween Costume Set ($39)

Whether your toddlers have a punk attitude or are just showing a love for rock-and-roll music early (you've gotta teach 'em young, after all), this matching sibling costume is bound to garner a lot of compliments and keep your kiddos feeling comfortable come Halloween night.

Adult Onesie Animal Halloween Costume ($26 and up)

Moo-ve over, kids — even if you and your sibling are all grown up, you can still celebrate your familial bond (and be the star of any Halloween party) with this hilarious animal costume set. Best of all, these sibling Halloween costumes are designed like a classic pair of pajamas, so you can wear them all night at a Halloween party and crash on the couch with them on, too.