Sexy Mermaid Costume Ideas for Halloween 2026: 4 Looks to Make a Splash

Mermaid costumes are shimmering, magical, and impossible to ignore. Iridescent scales, seashell tops, and flowing tails make this one of the most photogenic looks you can wear, and it works for Halloween parties, pool parties, and festivals alike. Here are four ways to make a splash from the sexy mermaid costumes collection at AMIClubwear.

1. The Mesmerizing Mermaid

Mesmerizing Mermaid 2 Piece Costume

This two-piece mermaid costume lives up to its name. It is glamorous, shimmery, and made to catch the light, which makes it perfect for parties and photos. Add a shell hair clip and iridescent makeup to complete the look. Shop the Mesmerizing Mermaid 2 Piece Costume.

2. The Starstruck Mermaid

Starstruck Mermaid 2 Piece Costume

Starfish meet sparkle in this dreamy two-piece. The Starstruck Mermaid is playful and eye-catching, and it is easy to wear all night long. Pair it with glitter on your shoulders and a pearl necklace. Shop the Starstruck Mermaid 2 Piece Costume.

3. The Flowing Tail

Royal Blue Green Mermaid Skirt One Piece Costume

Want a true tail silhouette? This royal blue and green one-piece has a flowing mermaid skirt that gives you that classic under-the-sea shape while still letting you walk and dance. Shop the Royal Blue Green Mermaid Skirt One Piece Costume.

4. The Beach-to-Party Mermaid

Mermaid Star Scalloped Print Two Piece Swimsuit

Here is a look that works well beyond October. This scalloped mermaid print two-piece swimsuit can be styled as a costume with a sheer skirt and shell accessories, then worn to the beach or pool all year. Shop the Mermaid Star Scalloped Print Two Piece Swimsuit.

Tips for a Sea Siren Look

Mermaid looks are all about shimmer. Try iridescent or blue-green eyeshadow, highlighter on your cheekbones and collarbones, and a little body glitter. Long beachy waves, a seashell or pearl hair clip, and a starfish accessory finish the look. Mermaid costumes are also a fun group idea, so dress your friends in different colors for a full ocean crew. Stock is limited, so order early in October.

Browse the full mermaid collection for more under-the-sea styles.

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