Mermaid Halloween Costume Ideas With A Swimsuit

Mermaid Halloween costume ideas with a swimsuit make it easy to create a water-ready look using a swimsuit as the base, plus your own accessories, makeup, and finishing touches. Explore inspiration for different styles, coverage preferences, and occasions—from poolside parties to last-minute costumes—so you can choose a look that feels comfortable, practical, and unmistakably mermaid.
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The Jetties One Piece LTThe Jetties One Piece LT

The Jetties One Piece LT

$112
199 Reviews
Available In: long torsoplus sizes

A navy eco-nylon one-piece swimsuit with a scoop back and adjustable crossover straps for supportive coverage.

The Lucaya One Piece LTThe Lucaya One Piece LT

The Lucaya One Piece LT

$134.00$54.00
Available In: long torso

A smocked one-piece swimsuit in bright begonia with a high-leg cut, open back, and adjustable straps.

The Rockley One Piece LTThe Rockley One Piece LT

The Rockley One Piece LT

$118.00$30.00
6 Reviews
Available In: long torsoplus sizes

A full-coverage one-piece in Baltic eco nylon, featuring a square neckline and wide, comfortable straps.

The Laguna One PieceThe Laguna One Piece

The Laguna One Piece

$134
402 Reviews
Available In: long torso

A long torso one piece in spotted leopard eco nylon with a deep open back and adjustable straps.

The Jetties One Piece LTThe Jetties One Piece LT

The Jetties One Piece LT

$112
200 Reviews
Available In: long torsoplus sizes

A cherry red one-piece swimsuit in eco nylon with a scoop back and adjustable crossover straps.

The Jetties One Piece LTThe Jetties One Piece LT

The Jetties One Piece LT

$112
200 Reviews
Available In: long torsoplus sizes

A chic black one-piece with a scoop back, adjustable crossover straps, and eco nylon fabric.

The Tulum One PieceThe Tulum One Piece

The Tulum One Piece

$142.00$114.00
1,508 Reviews
Available In: long torso

A shimmering blue one-piece designed for long torsos, offering low compression and elegant style.

The Bonita One PieceThe Bonita One Piece

The Bonita One Piece

$142
10 Reviews
Available In: long torso

A long torso one-piece swimsuit in a pink, purple, and red seersucker wave fabric with low compression.

The Kauai One PieceThe Kauai One Piece

The Kauai One Piece

$134
27 Reviews
Available In: long torso

A long torso one-piece swimsuit in blue and green paisley print, crafted from eco-friendly nylon.

The Tulum One Piece LTThe Tulum One Piece LT

The Tulum One Piece LT

$112
1,509 Reviews
Available In: long torsoplus sizes

A cherry red one-piece swimsuit in eco nylon with supportive cross back straps for active comfort.

The Tulum One Piece LTThe Tulum One Piece LT

The Tulum One Piece LT

$112
1,509 Reviews
Available In: long torsoplus sizes

A sleek black one-piece swimsuit in eco nylon with supportive cross back straps for active comfort.

The Full Coverage Tulum One PieceThe Full Coverage Tulum One Piece

The Full Coverage Tulum One Piece

$112
1,509 Reviews
Available In: cheeky to full coveragelong torsoplus sizes

A classic black one-piece swimsuit made from eco nylon with supportive cross back straps and full coverage.

The Majorca One PieceThe Majorca One Piece

The Majorca One Piece

$142
Available In: long torso

A black-and-white polka-dot swimsuit with a plunging neckline, adjustable halter, underbust elastic, and long-torso fit.

The Tulum One Piece LTThe Tulum One Piece LT

The Tulum One Piece LT

$128.00$102.00
1,509 Reviews
Available In: long torsoplus sizes

A white eco ribbed one-piece swimsuit featuring supportive cross back straps for athletic builds and larger chests.

The Fiji One PieceThe Fiji One Piece

The Fiji One Piece

$142
113 Reviews
Available In: long torso

A pink, textured one-piece swimsuit designed for long torsos with low compression for comfortable wear.

The Elwood One Piece LTThe Elwood One Piece LT

The Elwood One Piece LT

$122.00$49.00
23 Reviews
Available In: long torsoplus sizes

A formfitting cyan one piece in eco nylon with a plunging neckline and adjustable criss-cross back straps.

The Amalfi One PieceThe Amalfi One Piece

The Amalfi One Piece

$134
2,450 Reviews

A vibrant one-piece swimsuit in rainbow wide stripes, crafted from eco nylon with medium compression.

The Mykonos One Piece LTThe Mykonos One Piece LT

The Mykonos One Piece LT

$128
1,220 Reviews
Available In: long torsoplus sizes

A ribbed black one-piece swimsuit featuring a deep plunge neckline, designed for long torsos.

The Lanikai One PieceThe Lanikai One Piece

The Lanikai One Piece

$142.00$114.00
37 Reviews

A shimmering blue one-piece swimsuit featuring low compression for a comfortable, classic fit.

The Tulum One Piece LTThe Tulum One Piece LT

The Tulum One Piece LT

$112.00$90.00
1,509 Reviews
Available In: long torsoplus sizes

A white one-piece swimsuit in eco nylon with supportive cross-back straps, designed for long torsos.

The Mykonos One PieceThe Mykonos One Piece

The Mykonos One Piece

$128
1,220 Reviews
Available In: long torsoplus sizes

A sleek black one-piece swimsuit crafted from eco-friendly ribbed fabric with a flattering plunge neckline.

The Laguna One PieceThe Laguna One Piece

The Laguna One Piece

$134
402 Reviews

A classic one-piece swimsuit in eco nylon featuring shaved chocolate and white wide stripes with medium compression.

The Malibu One PieceThe Malibu One Piece

The Malibu One Piece

$134
1,916 Reviews

A vibrant pink and orange one-piece crafted from eco-friendly nylon with medium compression support.

The Pana One PieceThe Pana One Piece

The Pana One Piece

$122.00$85.00
38 Reviews
Available In: long torso

A strapless azalea one piece swimsuit in eco nylon with ruched bust, high leg, and cheeky coverage.