Photo: Pinterest

The eternal Halloween dilemma: what to wear. Whether you're attending a party with friends or a costume contest at work, if you don’t already have a costume in mind, you may want to consider clicking over to Pinterest for instant inspiration. The discovery platform has over 58 million Halloween-related boards, but don’t worry -- to help users sort through them all, they partnered with Lyst to highlight the top trending costumes for 2018. Unsurprisingly, most are inspired by popular movies (yes, Black Panther!) and shows while a few others come courtesy of viral beauty trends. Of course, there’s a hit of nostalgia, too!

Scroll through the most popular Halloween costumes below, then re-imagine one for yourself on October 31.

Mamma Mia Stars

Since the sequel hit theaters this summer, pins for these leading ladies shot up 1,636 percent. To get the look, grab a pair of flared jeans, a denim vest, and white boots -- all of which you probably already own. Accessorize with a microphone, and when it's your turn for karaoke, be sure to go with Abba tunes.

I, Tonya

Who can forget Margot Robbie’s take on competitive figure skater Tonya Harding in the darkly comedic biopic I, Tonya? Pins for this film-inspired look are up 720 percent. You can buy a similar figure skating costume online or bling out a leotard with sequins and rhinestones. Finish the look with ‘80s-style bangs.

Cow

This may seem like an odd costume to top the list, but the people at Pinterest point to Doja Cat’s viral “Mooo!” song. There are a number of ways to go about this look, the easiest being with a onesie, but we’re big fans of these cow print biker shorts paired with a matching jacket.

Edna Mode

Whether or not you have kids, it's safe to say you're familiar with "The Incredibles." Case in point: Pins for Edna Mode, the character known for acerbic one-liners, are up 669 percent. You can order this costume online, complete with a tunic, wig, and glasses, for $50.

Photo: Pinterest

Black Panther

You’ll feel like a total badass in a costume inspired by the blockbuster hit Black Panther. Pins for this Marvel superhero suit, worn by both men and women, are up more than 500 percent.

Riverdale cast

Consider this show the modern day Gossip Girl. If you're looking for a recognizable pop culture reference that's super simple DIY, a member of the Riverdale cast might be your best bet. Choose from a prep school sweater, cheerleader uniform, or P.E. attire (aka short shorts, a baseball tee, and athletic knee-high socks).

'90s icons

We were not surprised to see that pins for ‘90s icons like Britney Spears, Cher, and Kelly Kapowski have skyrocketed this season. In fact, we recently made our own list of ‘90s stars to choose from for Halloween.

Flamingo

Another animal topping the list, DIY flamingo costumes are fun and fast. All you need is a pink t-shirt, a few pink boas, leggings, and felt to make a beak. Check out this easy-to-follow tutorial by Pretty Providence.

Frida Kahlo

The late artist continues to be an icon of unconventional beauty, so it's safe to say this will be a popular costume choice for years to come. All you need is a floral tunic, flower crown, statement earrings, a chunky necklace, and a lot of eyebrow pencil to recreate her infamous unibrow.

Astrology makeup

Galaxy makeup started trending earlier this year, and pins for celestial makeup are now up 158 percent. While it's not necessarily an "everyday look," a star-studded face is the perfect costume if you're in a pinch.