Under the Sea live all kinds of creatures, from the whimsical and magical mermaids, to cute fish and threatening giants. The world of The Little Mermaid, for instance, is a great example of that, as it features all of the aforementioned types of characters and more.
If you expand the Under the Sea theme to all Ocean-inspired movies though, the costume possibilities become endless. Not only can you dress up as Ariel or Ursula, but you can also choose to be Nemo or Dory for All Hallow’s Eve.
The other great thing about the Under the Sea theme is that there are plenty of couple and group costumes to choose from. You can dress up as Ariel and the Prince, Ursula and the King, Nemo and Martin, Dory and and her parents or even The Little Mermaid and her ocean friends.
And if you want to be very practical while adopting the Under the Sea theme, you can always go out in the human version of Ariel on Halloween night.
There’s a lot to choose from, and you defnitely don’t need a lot of time, skill or money to fashion yourself a costume. Swim along with us through these Under The Sea Costumes and DIY Ideas.
No-Sew Jellyfish Costume
Looking to make a splash at your next Halloween party? Dive into the depths of creativity with a DIY no-sew jellyfish costume. This costume will float effortlessly through the night, captivating everyone with its ethereal glow. via alphamom
DIY Starfish Costume
For a beachy twist on classic Halloween attire, channel the enchanting allure of the ocean with a DIY starfish costume. With just a few simple materials you can transform into a whimsical sea creature, ready to dazzle under the moonlit sky. via alphamom
DIY Mermaid Costume
Unleash your inner sea siren with a DIY mermaid costume that’s as enchanting as the depths of the ocean. It will make you feel like you’ve just emerged from the sea, ready to mesmerize all who behold your aquatic beauty. via victoriakristinablog
Submarine Costume
Take your Halloween costume to new depths with a DIY submarine ensemble. Constructed from cardboard, paint, and a touch of creativity, this costume will have you feeling like you’re exploring the ocean floor in no time. via alphamom
Cardboard Lobster Costume
Get ready to claw your way into the spotlight with a quirky cardboard lobster costume. With a few simple supplies like cardboard, paint, and some crafty ingenuity, you can transform into a crustacean sensation that’s sure to make waves at any Halloween party. via thecardboardcollective
Easy DIY Pink Jellyfish Halloween Costume for Kids
Let your little one float through Halloween night with ease in an adorable pink jellyfish costume. This DIY ensemble is both simple to make and utterly charming, ensuring a magical undersea adventure for your child. via hellowonderful
DIY Sea Shell Halloween Costume
Channel the beauty of the ocean with a stunning DIY sea shell costume. You can create a whimsical ensemble that captures the enchanting allure of the sea. via alphamom
Fish Costume
Swim into the spotlight with a delightful fish costume that’s perfect for Halloween. This DIY ensemble will have you feeling like a vibrant and playful denizen of the deep. via alphamom
Simple Shark Costume
Make a splash at your next Halloween party with a simple yet striking shark costume. With just a gray hoodie, some felt, and a bit of crafting magic, you can transform into the ultimate apex predator of the sea. via makeit-loveit
DIY Scuba Diver Halloween Costume
Dive into Halloween festivities with a DIY scuba diver costume that’s as fun to make as it is to wear. With a wetsuit, goggles, and a few cleverly repurposed household items, you can create a look that’s perfect for exploring the underwater wonders of the Halloween party scene. via delineateyourdwelling
Easy Shark Hat
Dive into Halloween with an easy-to-make shark hat that adds a touch of playful ferocity to any costume ensemble. You can whip up this fun accessory in no time, perfect for both kids and adults looking to add a bite to their Halloween look. via gluesticksgumdrops
Octopus Costume
Get ready to make a splash with an adorable octopus costume that’s as cute as it is creative. You can create this whimsical costume that’s sure to turn heads and tentacles at any Halloween party.
Seahorse Costume
Harness the enchanting beauty of the sea with a seahorse costume that’s both elegant and easy to make. With a touch of creativity, you can transform into this magical creature for Halloween, adding a touch of undersea charm to the festivities.
Stingray Costume
Glide through Halloween with an eye-catching stingray costume that’s sure to make a splash. This costume captures the graceful beauty of these ocean creatures, making it a standout choice for any Halloween party or trick-or-treating adventure. via imgur
DIY Turtle Shell Costume
Embrace the slow and steady charm of the turtle with a DIY costume that’s both adorable and easy to create. Using recycled materials, you can fashion a turtle shell that’s perfect for both kids and adults, adding a touch of undersea whimsy to your Halloween festivities.
Rainbow Fish Costume
Bring a burst of color to Halloween with a vibrant rainbow fish costume that’s bound to dazzle. This DIY costume captures the magical allure of the rainbow fish, making it a dazzling choice for Halloween parties or parades. via trishstitched
DIY Dory Costume
For fans of the beloved movie “Finding Nemo” and “Finding Dory,” a DIY Dory costume is an irresistible option. You can transform into everyone’s favorite forgetful fish. Whether you’re swimming through a Halloween party or embarking on your own oceanic adventure, this costume is sure to bring smiles wherever you go. via babble
DIY Whale Halloween Costume
Make a splash this Halloween with a DIY whale costume that’s as charming as it is simple to create. You can fashion a whale costume that’s perfect for kids and adults alike. Whether you’re diving into a costume contest or trick-or-treating with friends, this whale costume is sure to be a hit.
Puffer Fish Costume
Embrace the whimsical charm of the underwater world with a DIY puffer fish costume. Crafted with creativity and a bit of craft magic, this costume is sure to turn heads at any Halloween gathering. via thinkcrafts
Crab Costume
Channel your inner crustacean with a playful crab costume that’s both adorable and easy to make. Whether you’re scuttling through the neighborhood on Halloween night or attending a costume party by the sea, this DIY crab costume is sure to be a standout.
Mermaid Costume for Kids
Every kid dreams of being a mermaid, right? Well, with this DIY mermaid costume, their underwater fantasies come to life! Shimmering scales, flowing tails, and a sprinkle of magic – they’ll be the belle of the undersea ball. Watch out, Ariel, there’s a new mermaid in town! via mandyringephotography
DIY Jellyfish Tutu Dress Costume
Get ready to float through Halloween night in style with this DIY jellyfish tutu dress costume. Layers of tulle, shimmering tentacles – it’s like something out of a fairy tale! Whether you’re dancing the night away or trick-or-treating with friends, this costume is sure to make waves. via thehairbowcompany
Easy Squid Costume
Why be ordinary when you can be extraordinary? With this easy squid costume, you’ll stand out from the Halloween crowd. Those flowing tentacles and expressive eyes are guaranteed to turn heads. Get ready to make a splash!
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