Get ready for a splashy Halloween with our top picks featuring Ariel’s best buddy Flounder and the beloved ocean princess herself. This guide highlights five kid-friendly costumes inspired by The Little Mermaid, offering officially licensed looks, soft fabrics, and easy wear for active little ones. Compare sizes, materials, and design details to find the perfect undersea outfit for trick-or-treating or themed parties.
| Product | Brand | Size | Highlights |
|---|---|---|---|
| Child Disney Little Mermaid Flounder Costume | Fun Costumes | Large | Velour fabric, back zipper, soft stuffing |
| Little Mermaid Flounder by elope | elope | Standard | Velour outer shell, fiberfill, approx. 12″L x 9″W x 8″H |
| Disney Princess Ariel Costume — The Little Mermaid | Fun Costumes | Medium | Licensed Disney, mermaid dress, cosplay ready |
| Little Mermaid Flounder Kids Costume (Yellow Tunic) | Fun Costumes | Small/Medium | Pullover tunic, Flounder face & body |
| Flounder Toddler Costume — 4T | Fun Costumes | 4T | Velour bodysuit, foam-backed tail fin |
Note: This selection avoids prices and focuses on official licensing, material quality, sizing options, and overall suitability for preschool to early elementary ages. All items link to Amazon product pages for easy purchasing decisions.
Child Disney Little Mermaid Flounder Costume

Product from Fun Costumes features a Large size Flounder bodysuit crafted from 100% polyester velour with fiberfill stuffing. The bodysuit closes with a back zipper for simple on/off wear, making it a practical option for quick costume changes during Halloween activities. The design emphasizes Flounder’s friendly face and bright yellow body, suitable for fans of The Little Mermaid who want a cozy, character-accurate look for kids.
Flounder Companion Plush Costume — elope

The elope Flounder costume offers a standard-size plush figure with a velour outer shell and fiberfill stuffing. Measuring about 12 inches long, 9 inches wide, and 8 inches high, it presents a lightweight, cuddly option for kids who prefer a soft, non-rigged costume silhouette. The plush assembly allows for comfortable wear and easy movement during events or trick-or-treating.
Disney Ariel Costume — The Little Mermaid

This officially licensed Fun Costumes Ariel dress brings the iconic princess look to life with a classic mermaid silhouette. The costume is designed for medium-sized wearers, enabling comfortable movement for playtime and party activities. It captures the movie’s color palette and character appeal, making it a top option for fans who want a true Disney feel without complexity in the dress-up process.
Flounder Kids Costume — Yellow Tunic

The Flounder tunic-style costume includes a pullover fish tunic showing Flounder’s cheerful face and body. This design prioritizes easy wearability and visual recognition, making it ideal for younger children who want a simple, comfortable outfit for Halloween festivities. It aligns with licensed Disney imagery and is suitable for varied undersea-themed events.
Flounder Toddler Costume — 4T

Designed for toddlers, this 4T Flounder costume uses a velour bodysuit with a foam-backed tail fin and fin-shaped sleeves to suggest Flounder’s distinctive look. The official Disney tie-in ensures character accuracy while the lightweight materials support active play. It is a practical option for parents seeking an age-appropriate undersea character outfit that’s easy to wear and durable for multiple wears.
Flounder Infant Costume — 12/18 Months

Infant option from Fun Costumes features a Flounder bodysuit with a hat headpiece, tailored for 12/18 months. The set prioritizes soft materials and gentle construction, offering a cozy undersea look for babies during Halloween celebrations or family-themed events. Its compact size ensures safe wear for curious infants.
Buying Guide: Key Purchase Considerations For Ariel And Flounder Costumes
- Age and size range: Check the available sizes (infant, toddler, child, and medium) to ensure a comfortable fit that allows for movement and layering if needed.
- Material quality and care: Velour and plush fabrics provide a soft feel and durability, while back zippers and easy closures simplify dressing and undressing.
- Character accuracy: Officially licensed items tend to reflect authentic design elements from The Little Mermaid, increasing realism for fans.
- Ease of wear for events: Consider costumes with simple pull-over designs or back zippers for quick changes at parties or trick-or-treating routes.
- Comfort and safety: Lightweight construction and open necklines help prevent overheating; avoid heavy embellishments that may irritate sensitive skin.
- Versatility: Some options are tunics or bodysuits that can be mixed with accessories to extend playtime beyond Halloween.
- Care considerations: Look for costumes that are machine washable or easy spot-clean to maintain color and texture after active use.
- Budget and maintenance: While licensed outfits may command higher prices, durability and comfort can justify the cost for frequent wear.