---
title: "Rumi Costume — $2.5M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/rumi-costume"
last_updated: "2026-08-06T05:11:57.138Z"
locale: en
meta:
description: "Niche score 61/100 · $2.5M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 61/100 · $2.5M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Rumi Costume — $2.5M/yr Amazon US Niche (2026) - Flapen"
---
# **rumi costume**
**Worth a look**
Shows a $2.5M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 95Growth 7Conversion 10Competition 81Returns 16Price range 90Avg price 95Brand share 84Review moat 93Quality gap 82
**Market size**
**Incredible****$2.5M**
$2.5M/yr · 8.0M searches
**Avg price**
**Incredible****$38.52**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****148.13**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Great****$9.56–$93.19**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Great****51%**
top-5 brand share — no brand owns this niche
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Competition**
**Great****34%**
top-5 click share — an open shelf
**Returns**
**Bad****7.5%**
return rate — above 5% kills the launch gate
**Conversion**
**Bad****0.8%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Bad****-36.3%**
90-day search growth — must beat 0% to launch
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, rumi costume is a $2.5M/yr Amazon United States market (8.0M searches/yr). The top 5 brands hold 51% of demand. Verdict: Worth a look — 61/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **rumi costume market data**
- **Units sold / yr**
- **60K–80K**
- avg 500–750/product
- **Revenue / yr**
- **$2.3M–$3.1M**
- units × avg price
- **Conversion rate**
- **0.8%**
- **Avg BSR**
- **#4,971**
- **Page quality**
- **0%**
- **Prime**
- **76%**
- **Sponsored**
- **74%**
- **Out of stock**
- **46.3%**
- **Avg brand age**
- **21 months**
- **Avg seller age**
- **170 days**
## **Competition & brand share**
Clicks spread well past the top 5 (34% combined) — an open shelf where new products get seen.
**Brands**
**26 **
**Sellers**
**30**
**Top-5 brand share**
**51%**
Top 20: 94%
**Top-5 click share**
**34%**
Top 20: 71%
**Open market**
**44%**
- WYYXXT19% - AOVCLKID11% - FENGLONG-YB8% - JIEANYAN7% - RUXINRUA6% - Lgandpg5%
## **Demand**
Weekly Amazon search volume, last 46 weeks — -36.3% search growth over the last 90 days.
900K700KSpike '25Aug '25Oct '25Nov '25Jan '26Mar '26Apr '26Jun '26
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/rumi-costume/trend)
## **Top rumi costume search terms**
- **rumi costume kids**4.5M/yr-34.4%0.5% conv. - **rumi costume**1.1M/yr-41.1%0.2% conv. - **disfraz de rumi para nia**164K/yr-39.7%0.2% conv. - **rumi kpop demon hunters costume**372K/yr+53.3%0.2% conv. - **k-pop demon hunters costume rumi**506K/yr-61.1%0.2% conv. - **rumi costume girls**146K/yr-47.1%0.4% conv. - **kpop demon hunters costume rumi**255K/yr-40.2%0.1% conv. - **kpop demon hunters rumi costume**93K/yr-28.6%0.3% conv. - **kpop rumi costume kids**74K/yr-29.3%0.5% conv. - **rumi golden costume**70K/yr-16.5%0.1% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/rumi-costume/search-terms)
## **Top rumi costume 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%4%$98K8%$196K12%$295K16%$393K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**WYYXXT 2Pcs Girls Rumi Princess Loose Comfortable Home Wear Dress 5-6 Years Multicolor**WYYXXT**$24.05**5.0★3 rev](https://www.amazon.com/dp/B0GFP3QHFJ) [2**Purple Braiding Hair 24Inch 3 Packs Braiding Hair Pre Stretched Colored Hair Extensions for Twist or Box Braids Long Synthetic Crochet Braids for Stage Party Christmas Halloween Costume Cosplay**JIEANYAN**$10.88**4.6★663 rev](https://www.amazon.com/dp/B0FPQX8TYY) [3**WYYXXT Girls Rumi Princess Cartoon Daily Dress Halloween Birthday Party Pop Outfits(4-5T Yellow)**WYYXXT**$23.54**4.2★3 rev](https://www.amazon.com/dp/B0GPM4WDL2) [4**FENGLONG-YB Costume Cosplay Golden For Girls Women With Wigs Halloween Top Pants Full Set Outfit**FENGLONG-YB**$74.78**3.6★95 rev](https://www.amazon.com/dp/B0FSLZFMXT) [5**RUXINRUA Girls Cosplay Costume 3-13 Years Kids Lining Jacket Shorts 3PCS Uniform Outfits with Wig (5-6 years)**RUXINRUA**$42.50**4.8★48 rev](https://www.amazon.com/dp/B0CMDF377W)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**ZBDFNJ Yellow Clothing Blue Clothing Complete Set of Tops Pants Wig Accessories Theme Party Outfit**ZBDFNJ**$34.75**1 rev3mo ago](https://www.amazon.com/dp/B0GVLYVFC9) [**AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 7-8 Years Yellow/Gold**AOVCLKID**$21.18**9 rev4mo ago](https://www.amazon.com/dp/B0GS5PLYF2) [**AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 5-6 Years Yellow/Gold**AOVCLKID**$21.03**9 rev4mo ago](https://www.amazon.com/dp/B0GS5GQW79) [**KPJSDT Girls Stage Costume Jacket Tank Top Shorts Set Printed Halloween Outfit for Kids Party Dress Up**KPJSDT**$29.65**10 rev4mo ago](https://www.amazon.com/dp/B0GS1D3ZG1) [**WYYXXT Girls Rumi Princess Cartoon Daily Dress Halloween Birthday Party Pop Outfits(4-5T Yellow)**WYYXXT**$23.54**3 rev4mo ago](https://www.amazon.com/dp/B0GPM4WDL2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 5-6 Years Yellow/Gold**AOVCLKID**$21.03**4.8★**▲ 237%**](https://www.amazon.com/dp/B0GS5GQW79) [**KPJSDT Girls Stage Costume Jacket Tank Top Shorts Set Printed Halloween Outfit for Kids Party Dress Up**KPJSDT**$29.65**3.9★**▲ 237%**](https://www.amazon.com/dp/B0GS1D3ZG1) [**ZBDFNJ Yellow Clothing Blue Clothing Complete Set of Tops Pants Wig Accessories Theme Party Outfit**ZBDFNJ**$34.75**5.0★**▲ 234%**](https://www.amazon.com/dp/B0GVLYVFC9) [**RUXINRUA Girls Cosplay Costume 3-13 Years Kids Lining Jacket Shorts 3PCS Uniform Outfits with Wig (5-6 years)**RUXINRUA**$42.50**4.8★**▲ 234%**](https://www.amazon.com/dp/B0CMDF377W) [**AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 7-8 Years Yellow/Gold**AOVCLKID**$21.18**4.8★**▲ 233%**](https://www.amazon.com/dp/B0GS5PLYF2)
**~~View all trending →~~**
## **What buyers say about rumi costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**16%
*“The size was accurate”*
**Quality-Overall**14%
*“Great quality for this wig”*
**Value For Money**7%
*“I definitely think it was affordable and totally worth every penny for all the smiles and excitement”*
**Color**5%
*“Color was accurate”*
**Comfort-Overall**4%
*“They are comfortable”*
**Advertised Vs Actual Product**4%
*“Did the job”*
**Ease Of Use**3%
*“Ease to use”*
**Material Quality**3%
*“soft material”*
**Soft Feel**3%
*“The material feel soft and smooth”*
**Design-Overall**3%
*“Accurate design”*
### **What buyers complain about **
**Quality-Overall**22%
*“Bad quality”*
**Durability**22%
*“Easily broke”*
**Size-Overall**9%
*“Runs extremely large”*
**Value For Money**5%
*“Not worth the money”*
**Color**5%
*“The shorts fade after one wash to a gray color”*
**Material Quality**3%
*“so thin for the price the material could have been a lot better”*
**Strength**3%
*“is fragile”*
**Print Quality**2%
*“I was expecting cheap materials and crooked prints”*
**Product Condition**2%
*“also that this was resold it was for a birthday party this weekend so gross especially when purchased as a new item for it came with no tags just in a plastic bag”*
**Ease Of Use**2%
*“broke very easily”*
### **Top return reasons **
**Size-Overall**49%
**Quality-Overall**6%
**Defective Material/Parts**6%
**Advertised Vs Actual Product**5%
**Material Quality**4%
**Durability**3%
**Wig/Artificial Hair Quality**3%
**Weight Heavy**2%
**Color**2%
**Suitability Long Hair**2%
## **Common questions**
- **Is rumi costume profitable to sell on Amazon United States?**
- The niche generates $2.5M/yr across 46 tracked products. 17 of 45 products launched in the last 360 days are still selling. 90-day search growth is -36.3%. Flapen's verdict: Worth a look (61/100).
- **How competitive is the rumi costume niche?**
- 26 brands and 30 sellers compete. The top 5 products take 34% of clicks and top 5 brands hold 51% of demand.
- **What do buyers complain about in rumi costume?**
- Top complaints mined from reviews: Quality-Overall, Durability, Size-Overall. The return rate is 7.5% — above our launch gate.
- **What does it cost to enter the rumi costume niche?**
- Listings span $9.56–$93.19; the average listing price is $38.52 (sweet spot $15–$100). The average incumbent carries 148 reviews — the moat a new listing must climb.
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