---
title: "Sherlock Holmes Costume — £48K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/toys-games/sherlock-holmes-costume"
last_updated: "2026-07-31T13:50:53.857Z"
locale: en
meta:
description: "Niche score 48/100 · £48K/yr market · 83K searches/yr · £15.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · £48K/yr market · 83K searches/yr · £15.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Sherlock Holmes Costume — £48K/yr Amazon UK Niche (2026) - Flapen"
---
# **sherlock holmes costume**
**Skip it**
Soft demand (-82.3% this quarter) — this niche doesn't clear our bar today.
Market size 12Growth 0Conversion 47Competition 61Returns 50Price range 70Avg price 76Brand share 77Review moat 87Quality gap 76
**Review moat**
**Great****269.46**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Great****58%**
top-5 brand share — no brand owns this niche
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Great****£15.36**
avg listing price — sweet spot $15–$100
**Price range**
**Good****£6.35–£34.87**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Good****48%**
top-5 click share — leaders hold, buyers still browse
**Returns**
**Good****3.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Okay****3.8%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Bad****£48K**
£48K/yr · 83K searches
**Growth**
**Bad****-82.3%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, sherlock holmes costume is a £48K/yr Amazon United Kingdom market (83K searches/yr). The top 5 brands hold 58% of demand. Demand peaks in Feb–Mar–Oct–Nov. Verdict: Skip it — 48/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sherlock holmes costume market data**
- **Units sold / yr**
- **3K–4K**
- avg 100–250/product
- **Revenue / yr**
- **£46K–£61K**
- units × avg price
- **Conversion rate**
- **3.8%**
- **Avg BSR**
- **#1,309**
- **Page quality**
- **0%**
- **Prime**
- **85%**
- **Sponsored**
- **81%**
- **Out of stock**
- **10.8%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **196 days**
## **Competition & brand share**
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**19 **▲rising
**Sellers**
**27**
**Top-5 brand share**
**58%**
Top 20: 100%
**Top-5 click share**
**48%**
Top 20: 93%
**Open market**
**36%**
- GrassVillage20% - GYIOFAI12% - Kyndara10% - Fun Shack9% - I LOVE FANCY DRESS7% - NAUZE6%
## **Demand & seasonality**
Weekly Amazon search volume, last 65 weeks — -82.3% search growth over the last 90 days.
18K13KSpike '25Prime Day '25Spike '26Prime Day '26 seasonMayJunJulAugSepOctNovDecJanFebMarAprMayJunJul
Peak months: Feb, Mar, Oct, Nov · busiest ÷ quietest = 17.1×
[**Open Trend **](https://flapen.com/research/uk/toys-games/sherlock-holmes-costume/trend)
## **Top sherlock holmes costume search terms**
- **sherlock holmes costume**31K/yr-83.8%3.5% conv. - **detective costume**22K/yr-67.2%2.4% conv. - **detective hat**5K/yr-54.0%6.3% conv. - **sherlock holmes hat**5K/yr-57.3%5.7% conv. - **sherlock holmes costume adult**6K/yr-87.6%5.1% conv. - **detective costume kids**6K/yr-92.3%1.4% conv. - **sherlock holmes costume kids**8K/yr-97.5%2.7% conv. [**All search terms **](https://flapen.com/research/uk/toys-games/sherlock-holmes-costume/search-terms)
## **Top sherlock holmes 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%10%£5K20%£10K30%£14K40%£19K1101001K10K 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**GrassVillage Sherlock Holmes Fancy Dress 3pc Accessory Set Deerstalker Hat + Magnifying Glass + Victorian Look Pipe Detective Kit**GrassVillage**£8.33**4.3★1,190 rev](https://www.amazon.co.uk/dp/B06XDFWZFV) [2**6Pcs Detective Costume Accessories Set for Adult Victorian Detective Fancy Dress Kit with Cape Hat Glasses Magnifier Bow tie Fake Beards for Halloween Carnival Cosplay Mystery Parties Role Play**Kyndara**£19.15**4.7★4 rev](https://www.amazon.co.uk/dp/B0GJC97JD9) [3**GYIOFAI 5 Pcs Adults Detective Costume Accessories Set Detective Fancy Dress Kit with Hat Fake Mustache Bow Tie Black Frame Glasses Magnifier for Halloween Cosplay Carnival Word Book Day (Black)**GYIOFAI**£6.71**4.2★20 rev](https://www.amazon.co.uk/dp/B0G38HL31H) [4**Adults Victorian Detective Costume - Standard - Victorian Cape Matching Deerstalker Hat Black Bowtie Fake Pipe and Magnifying Glass - Adults World Book Day Book Week Fancy Dress Costume**I LOVE FANCY DRESS**£19.67**4.1★76 rev](https://www.amazon.co.uk/dp/B07XQGP111) [5**NAUZE 3 Pcs Detective Fancy Dress Accessory Set Magnifying Glass Pipe Deerstalker Hat Victorian Detective Sherlock Costume Kit for Halloween Party Accessories**NAUZE**£8.56**4.2★42 rev](https://www.amazon.co.uk/dp/B0CLD7QMQ5)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Victorian Detective Costume Set for Kids - Sherlock Holmes Fancy Dress with Deerstalker Hat Magnifying Glass for World Book Day Halloween Cosplay**Fictoria**£13.82**1 rev3mo ago](https://www.amazon.co.uk/dp/B0GSGFP9QK) [**10Pcs Detective Costume Set Detective Accessory Kit with Fedora Hat Fake Mustache Bow Tie Suspenders Earpiece Sunglasses Id Card Magnifier Notebook Invisible Ink Pen for Adults Halloween Cosplay**Kyndara**£8.27**0 rev4mo ago](https://www.amazon.co.uk/dp/B0GT3FFXKQ) [**EujRcf 4 Pieces Detective Costume Set Detective Hat Glasses Bow Tie Magnifying Victorian Costume Boys for World Book Day Outfits Halloween Party Accessories Dress up Party**EujRcf**£9.16**0 rev6mo ago](https://www.amazon.co.uk/dp/B0GJSWZ35N) [**6Pcs Detective Costume Accessories Set for Adult Victorian Detective Fancy Dress Kit with Cape Hat Glasses Magnifier Bow tie Fake Beards for Halloween Carnival Cosplay Mystery Parties Role Play**Kyndara**£19.15**4 rev6mo ago](https://www.amazon.co.uk/dp/B0GJC97JD9) [**GYIOFAI Victorian Detective Hat Deerstalker Hat Detective Sherlock Fancy Dress Accessory Lined Tweed Country Deerstalker Cap for World Book Day Outfits Halloween Party Accessories (Multicolor)**GYIOFAI**£6.35**7 rev7mo ago](https://www.amazon.co.uk/dp/B0G6D53PKK)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**10Pcs Detective Costume Set Detective Accessory Kit with Fedora Hat Fake Mustache Bow Tie Suspenders Earpiece Sunglasses Id Card Magnifier Notebook Invisible Ink Pen for Adults Halloween Cosplay**Kyndara**£8.27**0.0★**▲ 687%**](https://www.amazon.co.uk/dp/B0GT3FFXKQ) [**Victorian Detective Costume Set for Kids - Sherlock Holmes Fancy Dress with Deerstalker Hat Magnifying Glass for World Book Day Halloween Cosplay**Fictoria**£13.82**5.0★**▲ 652%**](https://www.amazon.co.uk/dp/B0GSGFP9QK) [**WALKER AND HAWKES - Harris Tweed Watson Deerstalker Hat - Gunmetal Grey - Small (57cm)**WALKER AND HAWKES**£33.27**4.4★**▲ 625%**](https://www.amazon.co.uk/dp/B09MQ9TWQX) [**Mens Black Vintage Tailcoat Jacket Fancy Cool Cosplay Costume Robe**GOLDSTITCH**£16.17**4.3★**▲ 529%**](https://www.amazon.co.uk/dp/B09XSXXM9W) [**6Pcs Detective Costume Accessories Set for Adult Victorian Detective Fancy Dress Kit with Cape Hat Glasses Magnifier Bow tie Fake Beards for Halloween Carnival Cosplay Mystery Parties Role Play**Kyndara**£19.15**4.7★**▲ 286%**](https://www.amazon.co.uk/dp/B0GJC97JD9)
**~~View all trending →~~**
## **What buyers say about sherlock holmes costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**45%
*“Great quality for a cheap hat”*
**Advertised Vs Actual Product**20%
*“True to image”*
**Value For Money**10%
*“Reasonably priced perfect for a murder mystery evening”*
**Size-Overall**10%
*“Good fit and shape looks great”*
**Fun/Entertainment Experience**5%
*“Good for fun”*
**Material Quality**5%
*“Good material”*
### **What buyers complain about **
**Quality-Overall**28%
*“however unable to upload for some reason as these would show the disgraceful quality of the product”*
**Shape/Style**22%
*“Cane folded into thirds so hat does not keep its shape at all”*
**Value For Money**17%
*“Not worth the money”*
**Size-Overall**11%
*“Too small”*
**Stitch/Finish/Polish**6%
*“the stitching is poor”*
**Material Quality**6%
*“Very thin material”*
**Durability**3%
*“it would probably fall apart”*
**Upholstery/Fabric Quality**3%
*“Flimsy fabric”*
### **Top return reasons **
**Size-Overall**71%
**Quality-Overall**11%
**Advertised Vs Actual Product**3%
**Material Quality**3%
**Shape/Style**2%
**Value For Money**2%
**Compatibility-Overall**1%
**Flexibility**1%
**Strength**1%
**Defective Material/Parts**1%
## **Common questions**
- **Is sherlock holmes costume profitable to sell on Amazon United Kingdom?**
- The niche generates £48K/yr across 26 tracked products. 0 of 7 products launched in the last 360 days are still selling. 90-day search growth is -82.3%. Flapen's verdict: Skip it (48/100).
- **How competitive is the sherlock holmes costume niche?**
- 19 brands and 27 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 58% of demand.
- **What do buyers complain about in sherlock holmes costume?**
- Top complaints mined from reviews: Quality-Overall, Shape/Style, Value For Money. The return rate is 3.0%.
- **When does demand for sherlock holmes costume peak?**
- Demand peaks in Feb–Mar–Oct–Nov; the busiest month runs 17.1× the quietest.
- **What does it cost to enter the sherlock holmes costume niche?**
- Listings span £6.35–£34.87; the average listing price is £15.36 (sweet spot $15–$100). The average incumbent carries 269 reviews — the moat a new listing must climb.
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