Poshmark’s Top Halloween Costumes of 2021

Spooky season is BACK and whether you’re celebrating at home or out and about, it’s time to get into the Halloween spirit! This year, more than ever before, people are turning to Poshmark to source their Halloween costumes—searchers are up 75% compared to last year! Not only can you score those hard-to-find pieces to complete your look, but you’re also softening your environmental footprint by shopping secondhand—a win-win. To top it off, we’re rounding up 12 Posh-approved costumes that anyone can recreate easily and affordably from group costumes for the whole family to last-minute getups! Keep scrolling to discover iconic costumes you can find right on Poshmark. 

P.S. Sellers, we’ve hidden some fun data treats throughout the blog for you for insight and inspo on what items are most in demand.

Group Costumes

Harry Potter

 Halloween is truly made for Harry Potter fans (I mean, when else is it acceptable to dress up like witches and wizards? Ok always? Cool.) and not only that, but this year marks the 20th anniversary of the Harry Potter and the Philosopher’s Stone! While HP fandom is forever, we’re seeing shoppers turn up the dial this year, especially–searchers for Harry Potter costumes are up 123% compared to last year! Gather a group of your favorite friends and take a walk down Diagon Alley to celebrate. There are so many different costumes to choose from and these styles below will have you all dressed up with just a flick of the wand.

Get the look: Harry Potter Apparel |Black Coats|White Button Downs|Ties 


The grungy, glamorous ’90s and nostalgia-inducing Y2K styles thas been taking up shoppers’ brain space of late, and it’s not slowing down for Halloween—searchers for “Clueless costumes” on Poshmark are up 71% compared to last year.  We’re seeing demand surge for “Clueless costumes,” there’s no better group trio costume to bring you back to the ‘90s valley rich girls than Cher Horowitz, Dionne Davenport, and Tai Frasier! From power suits to plaid, there are endless Beverly Hills babe pieces that’ll have everyone totally buggin’ over your Clueless costume.

Get the look: Plaid Skirts |Knee-high Socks|White Button Downs|Sweater Vests

Squid Game

If you haven’t heard of Squid Game, where have you been (we hope not playing Red or Blue with a man in a suit)? This Korean drama is Netflix’s most-watched series of all time and has become a cultural phenomenon, leaving everyone wanting more. Dress up as your favorite player or guard by shopping for a blue tracksuit or red zip-up hoodie and matching pants or sweats. Added bonus if you bring along a dalgona candy or a bag of marbles as an accessory.

Get the look: Blue Tracksuits |Red Tracksuits

Eras of Britney

Prepare for a very “Free Britney” Halloween. Poshers are taking to Poshmark to show their support for the pop idol a la Halloween costumes—searchers for Britney costumes are up 110% compared to last year. Britney Spears has delivered so many iconic looks that are still influencing today’s generations. From her iconic Baby One More Time outfit to her all-denim Justin and Britney look, we’ve got everything you need to pull off a one-of-kind Britney Spears costume.  

Get the look: Denim Dresses |Red Jumpsuits|Pleated Mini Skirt|White Button Downs

Pop Culture Costumes

Olivia Rodrigo

Pop star Olivia Rodrigo is taking Gen Z and Poshmark by storm, being named by Women’s Wear Daily as the “first Poshmark Pop Star.” It’s only right that we help you tap into Olivia’s iconic “Sour” album cover outfit. This costume will have you wanting to take a drive to your ex’s house to show them exactly what they’re missing.

Get the look: Plaid Mini Skirts | Tank Top | Acrylic Rings | Black Combat Boots

The Matrix

With the anticipation of The Matrix Resurrection release later this year, there is no better time to try on this duo costume. Whether it’s Trinity’s all-black leather ensemble or Neo’s long trench coat and black sunglasses, these costumes are easy yet fashionable to rock this Halloween. 

Get the look: Trench Coats | Black Sunglasses | Leather pants for her | Black pants for him


If you’re ready to leave everyone swooning over your costume, Lady Whistledown is suggesting a Bridgerton-inspired costume. Bring yourself back in time to the early 1800’s in these traditional looks with some vintage dresses, pearl necklaces, and dainty accessories that you can find only on Poshmark—they’ll have you looking flawless. 

Get the look: Corset Dresses | Pearl Necklaces | Short Gloves

Gossip Girl

 Keep it chic and classic whether you’re a Blair or Serena this Halloween with an original Gossip Girl-inspired costume. A decade ago Gossip Girl made a fashion impact, and now with the reboot, we’ve seen this popular TV show leave its mark on pop culture. If you’re ready to live out your inner upper east side gal, this costume is for you. Xoxo, Gossip Girl

Get the look: Headbands | Pleated Mini Skirt | Over The Knee Boots | Dior Saddle Bags

Last-Minute Costumes

Dinosaur Inflatables

If you’re looking for an easy costume that is sure to make people laugh, then look no further! These dinosaur inflatable costumes have been a hit every year and continue to trend every Halloween (we even see them worn after Halloween!). This year, the dinosaur inflatable has been a top-searched costume on Poshmark with searchers up 174% compared to last year. Talk about RAWR!

Get the look: Kids Dinosaur Costumes| Dinosaur Inflatables

Adam Sandler

Halloween costumes tend to fall into one of two categories: all out, show-stopping effort, and last-minute, on-the-fly low effort. If you’re looking to keep it cool and casual, then it’s time to embrace your inner Adam Sandler, the king of comfy casual. Keep it low-key with his classic oversized t-shirt and basketball shorts. Bonus points if you add his iconic sunglasses and a cup of coffee.

Get the look: Basketball Shorts | Superman Shirt | Black Sunglasses


There is nothing more magical than transforming yourself into a princess. Be the beauty of the ball in a classic yet easy costume. The best part? This costume is perfect for all ages (yes, even that little princess inside of you).

Get the look: Crown Tiaras | Silver Statement Necklaces | Glamour Gowns

Bob Ross

In the famous words of Bob Ross, “There are no mistakes, just happy accidents.” With that in mind, there’s no way that you can mess up this casual yet simple costume. Two words: Denim. Everything. Dress up the look with a curly brown wig and beard and a DIY artist’s palette. Now that’s what we call a work of art

Get the look: Denim Shirts | Levi’s Denim

Data represented in this blog post is from September 1 – September 21. ‘Searchers’ refers to the number of people searching for a keyword.

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