Mermaid Costume Ideas: Ariel, Skeleton, Sexy & Kids (2026)

A mermaid costume works for Halloween, themed parties, under-the-sea events, bachelorette nights, and birthday parties — and the options range from Disney-faithful Ariel looks to edgy skeleton mermaids to shimmering fantasy kits. This guide covers the full range of mermaid costumes at Costume-Shop.com, organized by style so you can find the right look fast.

Women's Mermaid Costumes

Majestic Mermaid Costume — The Full Fantasy Look

The Majestic Mermaid Costume ($91.00) is the most complete women's option in the collection. The 3-piece set includes the tail skirt, sequined top, and accessories — everything you need for a finished, photo-ready mermaid look. The iridescent fabric catches light beautifully, making it ideal for parties where you'll be photographed.

Iridescent Mermaid Costume Kit — Budget-Friendly Shimmer

Looking for serious shimmer at a lower price point? The Iridescent Mermaid Costume Kit ($40.88) gives you the essential mermaid elements — the tail skirt and top — in a kit format that's easy to wear and layer. Great for pairing with accessories you already own.

Women's Hipster Mermaid — Modern Boho Take

The Women's Hipster Mermaid ($70.98) puts a boho-modern spin on the classic look. Less fairy-tale, more fashion-forward — this one works well for costume parties where you want to look great but not overly theatrical.

Skeleton Mermaid — Halloween's Dark Twist

The Women's Skeleton Mermaid Costume ($66.50) is the Halloween-specific pick that merges two beloved costume categories: the eerie skeleton aesthetic and the flowing mermaid silhouette. Bone-printed fins, a dark color palette, and a Gothic vibe make this the right choice when you want something spooky rather than sparkly. Perfect for horror-themed Halloween events.

Kids' Mermaid Costumes

Girls' Classic Mermaid Costume

The Girl's Mermaid Costume ($41.86) covers the core girls' mermaid look — shimmering tail skirt, coordinating top, and a style that reads instantly as "mermaid" without being a specific Disney character. Works for birthdays, dress-up days, and Halloween equally well.

For a wider range of girls' options, check the Girl's Halloween Costumes collection.

Mermaid Costume for Girls — Fantasy Style

The Mermaid Costume for Girls takes the fantasy mermaid direction — flowing fabrics, ocean-blue coloring, and a silhouette that encourages imaginative play. Great for younger girls who want to feel like they're truly from the sea.

Little Mermaid: Ariel Costumes

Disney's The Little Mermaid is the reference point for millions of kids' mermaid costumes. Costume-Shop carries multiple Ariel options across age ranges — here's how they break down:

Baby Ariel — First Halloween Look

The Baby Disney's Little Mermaid Ariel Costume is the 12–18 month version — soft fabric, easy diaper access, and the instantly recognizable Ariel colorway. Perfect for a baby's first Halloween. Browse more options in Baby Costumes.

Kids' Classic Ariel Costume

The Kids Classic Little Mermaid Ariel Costume is the standard children's version — the green tail skirt and purple shell top combination that every kid recognizes. Available in small (4–6), it's sized for the toddler-to-early-elementary range.

Ariel Mermaid Magic — Deluxe Look

The Ariel Mermaid Magic and Ariel Classic Costume offer different takes on the character — the Magic version adds shimmer and detail for a dressier presentation, while the Classic is the faithful, recognizable look. Both work well for Disney-themed events and the Disney Costumes collection has related character options.

Styling Your Mermaid Costume

Hair & Accessories

Mermaid hair is part of the look. Long, wavy, and preferably with some ocean-color highlights (seafoam green, teal, or sandy blonde for Ariel). If your natural hair doesn't cooperate, a wig in the right shade pulls the look together instantly. A starfish or shell hair clip adds the finishing detail.

Shoes

This is the mermaid costume's practical challenge — the tail skirt restricts stride length. Strappy sandals, flat Mary Janes, or even bare feet (for indoor events) work best. Avoid heels that require a full-length stride.

Makeup

Ocean-inspired makeup: iridescent highlights on the cheekbones, soft blue-green eyeshadow, and a shimmery base foundation. For the skeleton mermaid variant, bone-white face paint with dark eyes creates the horror-mermaid contrast.

Mermaid Costume Occasion Guide

Shop Mermaid Costumes

Ready to find your mermaid look? The Mermaid Costumes collection has every style covered — from baby Ariel to skeleton mermaids to full fantasy kits. Browse the full range and find the look that fits your occasion, budget, and vibe.

Also check our Disney Costumes for coordinating character looks, or the Girl's Halloween collection for age-appropriate options for younger mermaids-in-training.