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 Mykonos One PieceThe Mykonos One Piece

The Mykonos One Piece

$112
1,220 Reviews
Available In: long torsoplus sizes

A plunging one-piece swimsuit in classic navy, crafted from eco-friendly nylon for timeless style.

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 long torso one-piece in Baltic eco nylon featuring max coverage, a square neckline, and wide 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 crafted from eco nylon with a scoop back and adjustable crossover straps.

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 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 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 Jetties One PieceThe Jetties One Piece

The Jetties One Piece

$112
200 Reviews
Available In: long torsoplus sizes

A cherry red one-piece swimsuit featuring a scoop back and adjustable crossover straps for a chic look.

The Mykonos One Piece LTThe Mykonos One Piece LT

The Mykonos One Piece LT

$112
1,220 Reviews
Available In: long torsoplus sizes

A cherry red one-piece swimsuit in eco nylon with a plunging neckline, designed for long torsos.

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 made from 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 Tulum One PieceThe Tulum One Piece

The Tulum One Piece

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

A navy one-piece swimsuit with supportive cross-back straps, ideal for athletic builds and larger chests.

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 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 swimsuit designed for long torsos with comfortable low 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 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.