To complete your mermaid costume, try adding shimmering accessories that match the ocean theme. A seashell headband, pearl jewellery, and a glittering body chain all help to enhance the under-the-sea look. You can also add a sparkly makeup look with sea-coloured eyeshadow and a touch of body glitter. Don’t forget a matching mermaid bag or shell purse to finish the outfit perfectly.
Why Parents Trust Planet Mermaid
Our commitment to quality, safety, and customer satisfaction is backed by industry certifications and expert endorsements.
Safety Testing
All related products comply with EVS-EN71-1 Toy Safety Standard and UK General Product Safety Regulations 2005. Rigorous testing ensures every item meets the highest safety standards for children.
Quality Materials
Premium craftsmanship and durable construction using high-quality materials. Every mermaid tail is designed to withstand active play and frequent use while maintaining comfort and style.
Positive Reviews
4.8 out of 5 stars from thousands of verified customers. Real parents trust Planet Mermaid for quality, reliability, and exceptional customer service that goes above and beyond.
Third-party Validation
Featured in leading parenting publications and reviewed by expert YouTubers. Independent validation from trusted sources confirms our commitment to excellence and innovation.
Thousands of 5 Star Reviews ⭐️⭐️⭐️⭐️⭐️
"We bought this for our 7 year old daughter for her birthday. She absolutely loved it and put it on straight away. She continued to wear it all day even in the bath. Good quality would highly recommend."
Matthew T.
Planet Mermaid Customer
Mermaid Accessories - Add A Little Extra Sparkle
Mermaid Essentials
Ocean Kiss Mermaid Leggings
Regular price
From £19.99
Sale price
From £19.99
Regular price
Make a splash in our Ocean Kiss Mermaid Leggings, with dazzling shades of pink and sea blue that mimic the sparkle of tropical tides. These premium swim leggings offer UV protection and quick-dry fabric, ideal for sun-soaked holidays and poolside play. Let your little mermaid shine all day long!
Make a splash in style – explore our full range of matching swim tops, bags, towels, and mermaid hair must-haves.
Part of the Ocean Kiss Collection
Coral Carnival Girls Swimsuit
Regular price
From £17.99
Sale price
From £17.99
Regular price
Brighten up your summer with this chlorine-resistant swimming suite for girls. As colourful as it can possible be this fun swimsuit will steal all the attention on the beach or in the swimming pool.
Please note that no rainbow swimsuit is the same due to its rainbow pattern and it can look differently depending on which side of the spectrum it was made of.
Available for age 3 to 11.
Composition: 85% Polyester, 15% Spandex
Measurements are given in cm
| Age | WAIST | HIP | CHEST | TORSO |
| 3-4 | 21 | 23.5 | 22.5 | 38.5 |
| 4-5 | 22 | 25 | 24 | 40 |
| 6-7 | 24 | 27 | 25 | 43 |
| 8-9 | 26 | 29 | 26 | 44 |
| 9-11 | 27.5 | 31 | 30 | 47.5 |
Colour in Mermaid Messenger Bag
Regular price
£20.00
Sale price
£20.00
Regular price
Awaken your inner mermaid with our enchanting collection of children's mermaid-themed swimwear and accessories. We're mermaid experts, based in the UK. We have a strong dedicated team of passionate professionals working hard to capture the magic mermaiding has to offer to children around the world and discover a gateway to a world of underwater enchantment!
MERMAID MAGIC
The Planet Mermaid Colour Your Own Mermaid Messenger Bag allows children to create a fun, wearable artistic and functional creation. Detailed with whimsical mermaid illustrations and details, it makes a gorgeous gift.
PERFECT GIFT
Wow them this Christmas, birthdays and any other special occasion with a personalised touch – this mermaid bag is the perfect canvas for young artists, making it a memorable and unique present. Perfect for any occasion and creative child! Suitable for kids aged 6 and over - why not treat your granddaughter, daughter or niece?
Educational Bag
Your little Mermaid will dive into the world of seashells and learn about some of the most captivating shells that come to life on this wonderful bag. Learn about the Queen Scallop Shell along with many others!
PORTABLE CANVAS
The high quality messenger bag crafting kit comes with 10 vibrant colour marker pens. Not only is it functional, but this bag fosters creativity and individuality, allowing children to express their personal style. Once coloured in, they'll be proud to use it as a school, swimming, sleepover or day bag.
HOURS OF FUN
Keep kids engaged and inspired with endless colouring possibilities, making this bag an ideal gift choice. fostering creativity and individuality with 10 felt tip pens.
"Be a Mermaid and Make Waves!" Girls White T-shirt
Regular price
£11.49
Sale price
£11.49
Regular price
£19.99
This girls’ white t-shirt is sure to make a splash with any little mermaid out there!
Our t-shirt comes adorned with blue print in a watercolour-style and pink hearts. Durable, cute and easily washable, it also affords protection for your little one from the sun and comes in two sizes. Not only that, but to complete your mermaid’s look, this pure cotton t-shirt perfectly complements our Ocean Kiss Mermaid leggings. Organic High-quality Tee, made in the UK.
- Global Organic Textile Standard (GOTS) Certified
Girls T-shirt Size Chart
| Age | Width (armpit to armpit) | Length (top shoulder to bottom) |
|---|---|---|
| 3-4 | 34cm (13 1/4 inches) | 42cm (16 1/2 inches) |
| 5-6 | 36cm (14 1/4 inches) | 46cm (18 inches) |
As Seen In
Frequently Asked Questions
The best shoes for a mermaid costume depend on where you’ll be wearing it. For parties or events, glittery sandals, silver heels, or iridescent pumps work beautifully. If you’re dressing up for a fun or casual occasion, flat sandals or ballet shoes in pastel or metallic tones will match the mermaid theme. Comfort is key, so choose shoes that let you move easily while still keeping the magical look of your costume.
Mermaid-inspired hair is all about soft waves and ocean-inspired colours. You can curl your hair for a beachy look or use temporary colour sprays in shades of turquoise, purple, or sea green. Add sparkly clips, pearl pins, or a shell crown to complete the look. Braids also work well and add to the underwater fantasy feel.
Yes, a mermaid costume is perfect for Halloween, fancy-dress events, and themed parties. It’s a fun and eye-catching choice that can be styled to look mystical, glamorous, or even spooky depending on your makeup and accessories. Whether you want a classic sea-princess look or a darker siren style, the mermaid costume is a versatile option that stands out.
Yes, our collection includes mermaid costumes for both children and adults. You’ll find a variety of styles, colours, and sizes to suit every age and occasion. From playful children’s mermaid outfits to elegant adult designs with shimmering fabrics, each costume captures the magic of the sea and helps you create the perfect mermaid look.
