---
title: "Costumes for Girls — $12K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/costumes-for-girls"
last_updated: "2026-08-11T11:49:58.236Z"
locale: en
meta:
description: "Niche score 35/100 · $12K/yr market · 1.0M searches/yr · $27.77 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 35/100 · $12K/yr market · 1.0M searches/yr · $27.77 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Costumes for Girls — $12K/yr Amazon US Niche (2026) - Flapen"
---
# **costumes for girls**
**Skip it**
Weak search conversion (0.0%) — this niche doesn't clear our bar today.
Market size 3Growth 14Conversion 1Competition 50Returns 24Price range 78Avg price 95Brand share 75Review moat 69Quality gap 33
**Avg price**
**Incredible****$27.77**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$6.54–$46.04**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****60%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Good****720.78**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****55%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Returns**
**Bad****5.3%**
return rate — above 5% kills the launch gate
**Growth**
**Bad****-21.9%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$12K**
$12K/yr · 1.0M searches
**Conversion**
**Bad****0.0%**
search→purchase rate — share of searches ending in a sale
**Signals**[** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%")
According to Flapen's Amazon United States niche tracking, costumes for girls is a $12K/yr Amazon United States market (1.0M searches/yr). The top 5 brands hold 60% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 35/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **costumes for girls market data**
- **Units sold / yr**
- **3K–4K**
- avg 0–100/product
- **Revenue / yr**
- **$83K–$111K**
- units × avg price
- **Conversion rate**
- **0.0%**
- **Avg BSR**
- **#2,263**
- **Page quality**
- **0%**
- **Prime**
- **96%**
- **Sponsored**
- **83%**
- **Out of stock**
- **17.1%**
- **Avg brand age**
- **34 months**
- **Avg seller age**
- **175 days**
## **Competition & brand share**
The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**19 **▼falling
**Sellers**
**54**
**Top-5 brand share**
**60%**
Top 20: 100%
**Top-5 click share**
**55%**
Top 20: 95%
**Open market**
**35%**
- Elibelle35% - mcuaeddu9% - FFNXKLDZSW6% - DSplay5% - Joyxiam5% - NXXBLLLY5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -21.9% search growth over the last 90 days.
800K600KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 199.8×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/costumes-for-girls/trend)
## **Top costumes for girls search terms**
- **halloween costumes for girls 10-12**184K/yr+59.1%0.0% conv. - **costumes for girls 10-12**106K/yr-35.3%0.1% conv. - **girls costumes 10-12**82K/yr-62.3%0.0% conv. - **cute costumes for girls**31K/yr-18.8%0.0% conv. - **cute halloween costumes for girls 10-12**26K/yr+73.9%0.0% conv. - **halloween costumes for girls 12-14**55K/yr+140.3%0.0% conv. - **halloween costumes for 11 year old girls**28K/yr+84.3%0.0% conv. - **girl costumes 7-8**30K/yr-45.3%0.0% conv. - **costume for girls 10-12**33K/yr-49.1%0.0% conv. - **girl costumes 10-12**42K/yr-64.6%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/costumes-for-girls/search-terms)
## **Top costumes for girls products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$1K20%$2K30%$3K40%$5K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 23 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Japanese Traditional Dress Kimono Robe for Kids Girls Costume Silk Folding Fans hairstick Fox mask Set(red Back 150cm)**Elibelle**$36.80**4.8★299 rev](https://www.amazon.com/dp/B0BZY3X5X7) [2**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (10-12 Years)**mcuaeddu**$36.83**4.6★169 rev](https://www.amazon.com/dp/B0GJNSYXH2) [3**Kids Girl Pirate Halloween Cosplay Costume (10-12Y)**DSplay**$46.04**4.2★303 rev](https://www.amazon.com/dp/B07LG1YNKB) [4**Joyxiam Kids Onesie One-Piece Pajamas Girl Halloween Costumes(10-12Years)**Joyxiam**$25.32**4.6★504 rev](https://www.amazon.com/dp/B0B6RDKPX2) [5**NXXBLLLY Kids Onesie Animal Pajamas Halloween Costumes Christmas Cosplay Costumes for Girl(10-12 Years)**NXXBLLLY**$20.68**4.6★162 rev](https://www.amazon.com/dp/B0D79GXRD5)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**SEHIOZNI Kids Funny Green Monster Onesie Silly Big Mouth Monster Cartoon Soft Plush One Piece (Purple 10-13 Years)**SEHIOZNI**$24.02**14 rev1mo ago](https://www.amazon.com/dp/B0H3DBS5HF) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (12-14 Years)**mcuaeddu**$35.53**169 rev3mo ago](https://www.amazon.com/dp/B0GSTNZ9CS) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (10-12 Years)**mcuaeddu**$36.83**169 rev5mo ago](https://www.amazon.com/dp/B0GJNSYXH2) [**Rarjuiey Halloween Toddler Girl Outfit Boo Romper Spaghetti Strap Ghost Jumpsuit Bell Bottoms Outfits Spooky Clothes (Boo Ghost Black 4-5T)**Rarjuiey**$14.65**141 rev1y ago](https://www.amazon.com/dp/B0FBRS9Z35) [**AstraPrime Unisex Kids Onesie Flannel Cosplay Costume Halloween Onesie Pajamas Home Clothing(8-10Years)**AstraPrime**$21.17**144 rev1y ago](https://www.amazon.com/dp/B0FBJWBZQX)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**SEHIOZNI Kids Funny Green Monster Onesie Silly Big Mouth Monster Cartoon Soft Plush One Piece (Purple 10-13 Years)**SEHIOZNI**$24.02**4.2★**▲ 522%**](https://www.amazon.com/dp/B0H3DBS5HF) [**GRACE KARIN Teen Girls Formal Dress Black Kids Sequin Fancy Party Prom Sparkly Pageant Birthday Graduation Dresses Size 10-12**GRACE KARIN**$35.95**4.8★**▲ 519%**](https://www.amazon.com/dp/B0CN931MWP) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (10-12 Years)**mcuaeddu**$36.83**4.6★**▲ 519%**](https://www.amazon.com/dp/B0GJNSYXH2) [**AstraPrime Unisex Kids Onesie Flannel Cosplay Costume Halloween Onesie Pajamas Home Clothing(8-10Years)**AstraPrime**$21.17**4.5★**▲ 516%**](https://www.amazon.com/dp/B0FBJWBZQX) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (12-14 Years)**mcuaeddu**$35.53**4.6★**▲ 515%**](https://www.amazon.com/dp/B0GSTNZ9CS)
**~~View all trending →~~**
## **What buyers say about costumes for girls**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**22%
*“fit as expected”*
**Fun/Entertainment Experience**18%
*“The kids are enjoying them”*
**Gifting Purpose**10%
*“Christmas gift for my grandson”*
**Quality-Overall**9%
*“Good quality”*
**Comfort-Overall**8%
*“Very comfy”*
**Value For Money**6%
*“Great value for the price”*
**Color**5%
*“Fun colors”*
**Brightness/Shine/Glow**4%
*“The lights are very bright and colorful”*
**Battery Inclusion**3%
*“Batteries are included”*
**Durability**3%
*“Durable and comfortable”*
### **What buyers complain about **
**Quality-Overall**17%
*“Couldve been better constructed basically just very cheap gloves with electronics inside it to flash”*
**Durability**16%
*“Broke Immediately”*
**Size-Overall**11%
*“Not true to size”*
**Material Quality**8%
*“Cheap material”*
**Smell**6%
*“Battery make it smelly”*
**Zipper Quality**6%
*“the zipper broke on it within a few uses”*
**Strap/String Quality**6%
*“Couldnt give it a five because the shoulder strap was not as adjustable enough to have it fit”*
**Color**6%
*“it's more of a pale purple not blue like the character”*
**Grip**3%
*“The fingers kept going out”*
**Product Condition**3%
*“Item arrived used”*
### **Top return reasons **
**Size-Overall**55%
**Functionality-Overall**5%
**Length**5%
**Zipper Quality**5%
**Advertised Vs Actual Product**4%
**Quality-Overall**4%
**Material Quality**2%
**Defective Material/Parts**2%
**Thigh Fit**2%
**Sleeve Fit**1%
## **Common questions**
- **Is costumes for girls profitable to sell on Amazon United States?**
- The niche generates $12K/yr across 23 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -21.9%. Flapen's verdict: Skip it (35/100).
- **How competitive is the costumes for girls niche?**
- 19 brands and 54 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 60% of demand.
- **What do buyers complain about in costumes for girls?**
- Top complaints mined from reviews: Quality-Overall, Durability, Size-Overall. The return rate is 5.3% — above our launch gate.
- **When does demand for costumes for girls peak?**
- Demand peaks in Sep–Oct; the busiest month runs 199.8× the quietest.
- **What does it cost to enter the costumes for girls niche?**
- Listings span $6.54–$46.04; the average listing price is $27.77 (sweet spot $15–$100). The average incumbent carries 721 reviews — the moat a new listing must climb.
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