Mermaid costume

Explore our collection of mermaid costumes for girls, from colourful mermaid dresses to princess-inspired fancy dress outfits. Whether you’re planning a birthday party, choosing a Christmas present or updating your child’s dressing-up box, discover designs with crowns, headbands, wigs and other matching accessories.

Our mermaid fancy dress collection includes simple outfits for everyday play and more elaborate costumes for special occasions. Compare the styles, sizes and accessories to find the right look for your little mermaid.

Mermaid Fancy Dress for Girls

A mermaid costume lets children step into an imaginary underwater world. Some girls love the look of a flowing mermaid dress, while others prefer a princess-style outfit with a crown and jewellery.

Our collection includes different styles of girls’ mermaid costumes, from outfits with a matching headband to designs with a wig, handbag or decorative accessories. Each offers a different way to dress up, making it easier to choose something that suits your child’s interests.

For girls who enjoy creating their own characters, a costume with several accessories offers more ways to change their look. For younger children who prefer simpler outfits, a dress with a matching headband may be a better choice.

How to Choose a Mermaid Costume for Kids

When choosing a mermaid costume for kids, start with three things: the design, the fit and the accessories included. A costume that looks beautiful in a photograph still needs to suit your child’s age and the way she likes to play.

Choosing the Right Mermaid Dress Size

Children’s clothing sizes can vary between designs, so check the measurements on the individual product page rather than relying on age alone.

Some of our costumes include a size guide showing dress length and bust measurements in centimetres. Comparing these with a dress your child already wears can help you choose a suitable fit.

Pay particular attention to the skirt length, especially if the costume will be worn for dancing, walking or active play at a party.

Which Accessories Come with a Mermaid Outfit?

Not every mermaid dress-up outfit includes the same accessories. Depending on the model, you may find a crown, headband, gloves, jewellery, wig or handbag.

For example, our Ariel-inspired mermaid costume includes a crown, headband, gloves, wand and jewellery. If your child enjoys changing hairstyles and creating different characters, our mermaid costume with wig and handbag offers another option.

Always check the contents listed on the product page before ordering, and make sure smaller accessories are suitable for your child’s age.

Ariel-Inspired and Little Mermaid Costumes

For children who love underwater princess stories, an Ariel-inspired mermaid costume is a popular style of fancy dress. Colourful dresses, decorative crowns and mermaid-tail designs help create a look inspired by fairy-tale adventures beneath the sea.

Whether your child prefers a classic Little Mermaid-style dress or a different mermaid princess outfit, focus on the details she enjoys most. A flower crown offers a different look from a traditional princess crown, while a wig or matching jewellery can add more possibilities for dressing up.

Explore the product photographs and included accessories to see which costume best matches your child’s preferences.

Mermaid Dress-Up Outfits for Birthdays, Parties and Christmas

A girls’ mermaid costume is a versatile fancy dress outfit for different occasions. It can be worn to a mermaid-themed birthday party, a school dress-up event or simply for imaginative play at home.

For a birthday celebration, a colourful mermaid dress can help your child take part in the party theme. Accessories such as crowns and handbags can also be used in other dressing-up games long after the event.

Mermaid outfits are also an option for Christmas presents, especially for children who enjoy fairy tales and make-believe adventures. If you’re buying a surprise gift, consider the child’s usual clothing size and whether she prefers simple dresses or outfits with several accessories.

Looking for Christmas inspiration? Read our guide to mermaid costumes for Christmas, featuring four gift ideas and practical advice on choosing an outfit.

Can You Swim in a Mermaid Fancy Dress Costume?

No. A mermaid fancy dress costume should not be used for swimming unless the manufacturer explicitly confirms that the product is designed for use in water.

The outfits in this collection are intended for dressing up, parties and imaginative play. They are different from swimming mermaid tails, which require specialised equipment, competent swimming skills and appropriate supervision.

If you’re looking for equipment designed for aquatic activities, visit our separate mermaid tails collection and check each product’s intended use and safety instructions.

Find Your Favourite Mermaid Costume

From a simple mermaid outfit with a matching headband to an elaborate princess-style dress with accessories, our collection offers different ways to bring your child’s favourite underwater stories to life.

Browse our mermaid costumes for girls, compare the available designs and size guides, and choose a fancy dress outfit she’ll enjoy wearing for her next adventure.