---
title: "Detective Costume — $289K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/detective-costume"
last_updated: "2026-08-11T21:33:23.797Z"
locale: en
meta:
description: "Niche score 55/100 · $289K/yr market · 389K searches/yr · $23.79 avg price. High returns (8.4%) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $289K/yr market · 389K searches/yr · $23.79 avg price. High returns (8.4%) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Detective Costume — $289K/yr Amazon US Niche (2026) - Flapen"
---
# **detective costume**
**Worth a look**
Shows a sweet-spot price point ($23.79 avg), but high returns (8.4%) keeps it on the watch list.
Market size 51Growth 14Conversion 39Competition 81Returns 13Price range 85Avg price 95Brand share 94Review moat 76Quality gap 58
**Avg price**
**Incredible****$23.79**
avg listing price — sweet spot $15–$100
**Brand share**
**Great****41%**
top-5 brand share — no brand owns this niche
**Price range**
**Great****$9.01–$58.04**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Great****34%**
top-5 click share — an open shelf
**Review moat**
**Great****472.21**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Market size**
**Good****$289K**
$289K/yr · 389K searches
**Conversion**
**Okay****3.1%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Bad****-22.6%**
90-day search growth — must beat 0% to launch
**Returns**
**Bad****8.4%**
return rate — above 5% kills the launch gate
**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%")
According to Flapen's Amazon United States niche tracking, detective costume is a $289K/yr Amazon United States market (389K searches/yr). The top 5 brands hold 41% of demand. Demand peaks in Oct–Nov. Verdict: Worth a look — 55/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **detective costume market data**
- **Units sold / yr**
- **10K–13K**
- avg 100–250/product
- **Revenue / yr**
- **$238K–$297K**
- units × avg price
- **Conversion rate**
- **3.1%**
- **Avg BSR**
- **#5,359**
- **Page quality**
- **0%**
- **Prime**
- **92%**
- **Sponsored**
- **81%**
- **Out of stock**
- **10.2%**
- **Avg brand age**
- **46 months**
- **Avg seller age**
- **191 days**
## **Competition & brand share**
Clicks spread well past the top 5 (34% combined) — an open shelf where new products get seen.
**Brands**
**41 **▲rising
**Sellers**
**59**
**Top-5 brand share**
**41%**
Top 20: 82%
**Top-5 click share**
**34%**
Top 20: 67%
**Open market**
**54%**
- HOVEOX11% - wevgbv9% - Colorful House8% - Fun Costumes7% - ERDOGLY6% - GVVJYXD5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -22.6% search growth over the last 90 days.
40K30KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Oct, Nov · busiest ÷ quietest = 8.9×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/detective-costume/trend)
## **Top detective costume search terms**
- **detective costume**105K/yr+1.0%2.7% conv. - **detective hat**47K/yr-9.7%3.7% conv. - **sherlock holmes costume**61K/yr-36.6%2.3% conv. - **sherlock holmes hat**34K/yr-28.3%3.5% conv. - **detective costume kids**27K/yr-49.5%1.7% conv. - **detective costume women**27K/yr-24.3%1.6% conv. - **kids detective costume**11K/yr-45.7%1.9% conv. - **detective props**6K/yr-12.3%1.6% conv. - **detective accessories**8K/yr-23.3%2.1% conv. - **detective outfit**5K/yr-14.2%1.8% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/detective-costume/search-terms)
## **Top detective 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%3%$9K6%$17K9%$26K12%$35K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**wevgbv Detective Costume 11pc Accessories Set Detective Hat Dress up Costume for Adults Men Women Halloween Spy Costumes**wevgbv**$20.94**4.6★59 rev](https://www.amazon.com/dp/B0F5PJX4TJ) [2**Colorful House Cloak Medieval Detective Cosplay Costume Short Cape for Adult Men and Women Role Play(Khaki 25.59)**Colorful House**$29.53**0.0★0 rev](https://www.amazon.com/dp/B0DQXXJF34) [3**HOVEOX Detective Costume Accessories Set Detective Costume Hat Prop Halloween Costumes**HOVEOX**$13.90**4.6★157 rev](https://www.amazon.com/dp/B0C9TCBPNB) [4**Adults Sherlock Holmes Hat & Poncho Costume Kit Classic Detective Outfit Standard**Fun Costumes**$31.16**4.8★8 rev](https://www.amazon.com/dp/B0D2J8M9J4) [5**GVVJYXD Detective Costume Accessories Set Outfit Accessories For Adults Women Men with Detective Hat for Dress Up**GVVJYXD**$16.80**3.0★6 rev](https://www.amazon.com/dp/B0G4QYXH89)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**GAKSK Detective Costume Accessories Set 10 PCS Detective Hat Halloween Cosplay Men Women Dress up Prop Adults Spy Outfit**GAKSK**$18.59**7 rev3mo ago](https://www.amazon.com/dp/B0GX1RMZ74) [**RUEGGVAT 14 PCS Adult Detective Costume Accessories Set Classic Sleuth Spy Kit with Deerstalker Hat Magnifying Glass Bow Tie Pocket Watch Mustache & Gloves for Halloween Cosplay Mystery Party**RUEGGVAT**$18.92**2 rev3mo ago](https://www.amazon.com/dp/B0GWQDTCDT) [**Adults Detective Costume Mens Womens Victorian Outfit Inverness Cape Deerstalker Hat for Halloween Cosplay Lace S**Univafeli**$28.32**0 rev3mo ago](https://www.amazon.com/dp/B0GW1BW5WR) [**Xerteam Detective Costume 20s Detective Costume Adults Hat Suspenders Tie Magnifying Glasses Mustache Detective Cosplay Halloween (style 1)**Xerteam**$17.07**1 rev9mo ago](https://www.amazon.com/dp/B0FWJWBV3J) [**ERDOGLY Detective Hat Detective Costume Accessories for Women & Men Cosplay Hat for Halloween Party Dress Up Brown**ERDOGLY**$16.52**32 rev1y ago](https://www.amazon.com/dp/B0F93FZ2GH)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**UTTPLL Men-Cotton-Gatsby-Newsboy-Driving Caps Soft Classic Irish Hats Golf Beret Flat Hat Cabbie Hunting Cap Halloween Christms Brown**UTTPLL**$9.01**4.5★**▲ 397%**](https://www.amazon.com/dp/B0DY7G2MZP) [**GAKSK Detective Costume Accessories Set 10 PCS Detective Hat Halloween Cosplay Men Women Dress up Prop Adults Spy Outfit**GAKSK**$18.59**4.8★**▲ 394%**](https://www.amazon.com/dp/B0GX1RMZ74) [**Adults Detective Costume Mens Womens Victorian Outfit Inverness Cape Deerstalker Hat for Halloween Cosplay Lace S**Univafeli**$28.32**0.0★**▲ 391%**](https://www.amazon.com/dp/B0GW1BW5WR) [**RUEGGVAT 14 PCS Adult Detective Costume Accessories Set Classic Sleuth Spy Kit with Deerstalker Hat Magnifying Glass Bow Tie Pocket Watch Mustache & Gloves for Halloween Cosplay Mystery Party**RUEGGVAT**$18.92**5.0★**▲ 381%**](https://www.amazon.com/dp/B0GWQDTCDT) [**Colorful House Cloak Medieval Detective Cosplay Costume Short Cape for Adult Men and Women Role Play(Khaki 25.59)**Colorful House**$29.53**0.0★**▲ 299%**](https://www.amazon.com/dp/B0DQXXJF34)
**~~View all trending →~~**
## **What buyers say about detective costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**25%
*“will fit as described”*
**Quality-Overall**19%
*“everything else was very good quality for cosplay”*
**Value For Money**16%
*“Worth the money”*
**Advertised Vs Actual Product**8%
*“Product as promised”*
**Comfort-Overall**6%
*“Very comfortable”*
**Durability**3%
*“Pretty durable”*
**Warmth**3%
*“They are warm”*
**Fun/Entertainment Experience**2%
*“Fun”*
**Material Quality**2%
*“Material was nice and sturdy”*
**Color**2%
*“The pipe is as expected, great color, realistic,”*
### **What buyers complain about **
**Size-Overall**42%
*“it was HUGE”*
**Quality-Overall**26%
*“Poor quality”*
**Value For Money**6%
*“very cheap”*
**Material Quality**4%
*“Fluffy like a slipper and polyester”*
**Shape/Style**1%
*“Did not looked right”*
**Transparency**1%
*“Cheaply made and almost see through”*
**Strength**1%
*“maybe rather flimsy”*
**Leak-Proof**1%
*“light bulb for talc leaks”*
**Stretchability/Expandability/Elasticity**1%
*“throughout the day I feel the cotton blend stretched”*
**Comfort-Overall**1%
*“For someone with a large head these may be uncomfortable”*
### **Top return reasons **
**Size-Overall**65%
**Material Quality**7%
**Quality-Overall**6%
**Shape/Style**5%
**Advertised Vs Actual Product**4%
**Color**2%
**Value For Money**1%
**Wrinkles**1%
**Length**1%
**Strength**1%
## **Common questions**
- **Is detective costume profitable to sell on Amazon United States?**
- The niche generates $289K/yr across 63 tracked products. 0 of 7 products launched in the last 360 days are still selling. 90-day search growth is -22.6%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the detective costume niche?**
- 41 brands and 59 sellers compete. The top 5 products take 34% of clicks and top 5 brands hold 41% of demand.
- **What do buyers complain about in detective costume?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Value For Money. The return rate is 8.4% — above our launch gate.
- **When does demand for detective costume peak?**
- Demand peaks in Oct–Nov; the busiest month runs 8.9× the quietest.
- **What does it cost to enter the detective costume niche?**
- Listings span $9.01–$58.04; the average listing price is $23.79 (sweet spot $15–$100). The average incumbent carries 472 reviews — the moat a new listing must climb.
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