13 Best Mermaid Halloween Costumes

If the Ariel look isn’t your thing, check out this sexier mermaid costume from Roma that hugs all your curves in metallic spandex and a fully boned corset.

This is a nice option if you want to go the sexy route without showing off your midriff. The gold sequin corset is fully boned for to support even larger cup sizes and laces up the back with matching green ribbon. The bodice design is perfect for fitting all types of body shapes and giving you the squeeze and cleavage you’re looking for. 

The skirt is clingy metallic spandex fish scale pattern over metallic blue sequins. It flares out around mid-calf to create a wide tail that completely covers your feet. Like all mermaid-style skirts, it will restrict how large of steps you can take but the stretch is helpful in that area.

Add this starfish necklace and earring set for an even beachier look.

Roma also makes this style of mermaid skirt as a strapless one-piece dress.

When I think of swimming mermaids, I think of light sparkling off those shimmering fish tails. This mermaid skirt covered in a holographic fish scale pattern is the definition of eye-catching. When the light hits this skirt, it’s show stopping.

The stretchy skirt is very form fitting for a sexy silhouette and flares out at the bottom for a mermaid tail look. It’s comfortable, fairly easy to move in, and rides high on the waist to be flattering for most body types.

Because it is so form fitting, it’s not a skirt that you can go jogging in and you’re going to be walking a little slower than usual, but do you see the diamond-like holographics? Totally worth it.

If you need a little more movement, they offer the same style also in a shorter length. This skirt comes in this stunning silver, but also in turquoise and green.

This seashell top will complete a look that will certainly turn a lot of heads.

For those who want a skirt that’s easier to walk in, Party King has you covered with this metallic, duo-chrome print set.

The super-stretchy skirt is made of metallic fabric that shifts colors from turquoise to purple depending on the lighting. It flares out around the knee to form a tailfin on either side with gauze filling in the center. this gives your legs more space to move and walk. The beads shown in the photo are attached directly to the skirt for belly chain look you don’t have to fiddle with.

The top is a small tank-top style bralette which is stretchy enough to be accommodating for many body shapes, though those with large chests might want to wear more support under it. It has white and gold sequins detailing and includes the gold chain accents at the center on the shoulders.

For some of us, Halloween is a time to scare the pants off our friends, neighbors, and anyone we pass on the street. If you like looking creepy but you still want to be a mermaid, Smiffy’s has you covered.

This two-piece costume comes with a dark purple tank top and fishtail skirt with exposed fish bones pattern. The top has attached hanging mesh which looks like it could be gross shedding fish skin so that’s awful and great at the same time.

The skirt is a highly iridescent purple-grey that flashes different colors when it moves in the light. Done the front of the skirt is a spine of bright white fish bones and a flared mermaid tail fin made of strips of shredded material. This mermaid hasn’t had a good week.

The skirt is ruched in the back to hug your curves (sexy zombies are a thing) and a slit in the front makes walking much easier than a lot of the other skirts. The accent fins are significantly larger on this skirt for a uniquely realistic look.

Most costumes run a little small but this one runs a teeny bit big, so just keep that in mind. 

Add a fish skeleton necklace for a complete, gruesome look.

For adults who don’t want to show a lot of stomach, this two-piece costume by Leg Avenue comes with a jeweled bodice and form fitting skirt.

The fins stand out and away from the hem of the skirt giving you that true mermaid silhouette. The lamè skirt has an aquatic, metallic sheen to it that gives it a sort of wet look and the tulle ruffles at the waist look like smaller fins.

The bodice is covered in shimmering sequins and gems and the closure in the back has a few rows of hooks so you can adjust it to your size. The skirt has some stretch to it which makes moving around easier.

If you’re short like me (five feet, no inches) plan on grabbing a good set of heels or know that you’ll have to hike this skirt up. Keep in mind when looking at sizing that the bodice runs a little small and the skirt runs a little big, so you’ll have to take your body shape into account when ordering.

Pair this glitter costume with a seashell tiara for a true princess of the sea look.

Straying away from us kids-at-heart, this Tween Mermaid Costume from InCharacter Costumes is a perfect look for ages eight and up.

The one-piece dress has a swirling purple and blue “bodice” that velcros in the back and has sheer shoulder straps that give this a princess feel to it.

The tapering skirt of the dress has purple and blue gradient fish scales creating an effect that looks like light glinting off an iridescent fishtail. A flare of purple and blue tulle creates a wide mermaid tail effect and the tulle accent around the waist adds to the appearance of fins. The material is thin and stretchy for comfort and easy movement.

A glitter and sequin headpiece is included to make your little mermaid feel like royalty.

It’s not just feminine folks who are in love with mermaids so let’s give the mermen some love.

These leggings (or meggings) are made for the more male-bodied of us who are looking to get in on the fun and magic of mermaids.

They are made by Revolver Fashion and all their products are handmade in Los Angelas, California. 

The leggings are made of a four-way stretch breathable spandex blend to be comfortable for long wear. They’re designed to work as a costume, workout clothing, or even as a bathing suit–all while being machine washable.

Besides this duo-chrome green color, these leggings also come in silver holographic, gold holographic, and rainbow.

For tops, you’ve got loads of options from just not wearing one and pairing the leggings with this sliced conch fossil necklace. If you’d prefer to cover up, you’ve got plenty of tops including this purple and light blue fish scale tank or this tee shirt that clearly identifies you as a merman.

Going back to a more feminine look, this mermaid costume by Fun Costumes shows just the tiniest bit of skin to evoke that traditional bikini look.

This is a two-piece costume that comes with a stretchy purple crop tank top with flattering ruffles and adjustable spaghetti straps.

It will show a bit of tummy but not too much. The skirt has a zipper in the back and is very form-fitting while still having some stretch. It has a layered look that you can adjust to your body shape and it flares out at the bottom in a very feminine cascade of fabric to create the mermaid fin effect. If you’re on the shorter side, plan on picking up heels.

This costume comes with the starfish hair clip but none of the other accessories shown. You can purchase the seashell bag, seaweed boa, and red wig separately.

For a more unique and spooky mermaid, you can go to your next Halloween party as a mermaid skeleton.

This velour dress comes in both kids’ and adults’ sizes so you can match your little one. The bone print, on both the front and back, is silver metallic and the tail is created by a flare of glittery netting by the feet and a smaller ruffle at the waist. 

Just because you don’t want to wear a skirt, doesn’t mean you can’t have a fabulous mermaid Halloween costume. These fish scale leggings from Alaroo with 3D illusion fins give you the aquatic look you’re going for but still allow you full range of movement.

You can run and dance to your mermaid heart’s desire. Plus they’re stretchy leggings so that’s about as comfortable as a Halloween costume gets. They are thankfully opaque, as I know I’ve ordered some leggings and ended up with thick, transparent tights which is not the same thing.

What’s extra nice about these is that once Halloween is over, you can still wear these out when you’re in a mermaid mood. These unique leggings are a clever take on the traditional mermaid costume and come in iridescent pink, green and yellow, pink, and green and orange.

For a top, check out this cute tank top with faux seashell bra so you can have a little more coverage but still feel like a sexy mermaid.

This adorable onsie set from Sozo Baby will turn your little human into a little mermaid for Halloween.

The 100 percent cotton onsie zips up with a protective snap cover by the neck and fold-over cuffs to prevent scratching. The closed bottom has a blue mermaid tail and the nude colored top has a faux seashell bra. It comes with a matching blue cap with pink seashell decal. This is sized for infants up to 28 inches long.

The only bad thing about this one is that the “nude” color isn’t great for people of color. If you’re looking for something that doesn’t assume you have light skin, check out this crochet set of three-piece set of crocheted infant mermaid tail, pink bra with pearls, and headband.

This metallic mermaid skirt has an intricate fish scale pattern and flared bottom that mimics the look of a mermaid tail.

The skirt is a one size fits all and the fabric is stretchy enough to make that work. It has an elastic waistband and I don’t know about you, but the phrase elastic waistband is like music to my ears. Being stretchy like this also means you can pull the skirt up as far as you like so it can be at your hips are more of a high-rise waist look.

The skirt is a metallic polyester and you have a choice of this beautiful green, blue, or pink. The skirt doesn’t include the jewelry in the photos but you could substitute it with this intricate belly chain.

The shown matching bikini tops in green, blue, and pink are sold separately as well as matching sleeves.

For your little one who doesn’t want to choose between being a mermaid or a princess, we have this cute costume from Padete.

It comes with this one-piece dress with a princess top with organza shoulder caps and a metallic mermaid tail bottom. You also get all the shown accessories: jeweled tiara, gloves, scepter, necklace, and clip-on earrings.

There are a variety of sizes available from ages two to 10.