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.

sherlock holmes costume

Skip it

Soft demand (-82.3% this quarter) — this niche doesn't clear our bar today.

Review moat

Great269.46

avg incumbent reviews — the moat a new listing must climb

Brand share

Great58%

top-5 brand share — no brand owns this niche

Quality gap

Great4.3★

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

Good48%

top-5 click share — leaders hold, buyers still browse

Returns

Good3.0%

return rate — above 5% kills the launch gate

Conversion

Okay3.8%

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

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

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.

Peak months: Feb, Mar, Oct, Nov · busiest ÷ quietest = 17.1×

Open Trend

Top sherlock holmes costume search terms

sherlock holmes costume31K/yr -83.8%3.5% conv.
detective costume22K/yr -67.2%2.4% conv.
detective hat5K/yr -54.0%6.3% conv.
sherlock holmes hat5K/yr -57.3%5.7% conv.
sherlock holmes costume adult6K/yr -87.6%5.1% conv.
detective costume kids6K/yr -92.3%1.4% conv.
sherlock holmes costume kids8K/yr -97.5%2.7% conv.

All 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.

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

GrassVillage Sherlock Holmes Fancy Dress 3pc Accessory Set Deerstalker Hat + Magnifying Glass + Victorian Look Pipe Detective Kit

GrassVillage£8.334.3★1,190 rev

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£19.154.7★4 rev

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£6.714.2★20 rev

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£19.674.1★76 rev

NAUZE 3 Pcs Detective Fancy Dress Accessory Set Magnifying Glass Pipe Deerstalker Hat Victorian Detective Sherlock Costume Kit for Halloween Party Accessories

NAUZE£8.564.2★42 rev

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£13.821 rev

3mo ago

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£8.270 rev

4mo ago

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£9.160 rev

6mo ago

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£19.154 rev

6mo ago

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£6.357 rev

7mo ago

What buyers say about sherlock holmes costume

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall45%

“Great quality for a cheap hat”

Advertised Vs Actual Product20%

“True to image”

Value For Money10%

“Reasonably priced perfect for a murder mystery evening”

Size-Overall10%

“Good fit and shape looks great”

Fun/Entertainment Experience5%

“Good for fun”

Material Quality5%

“Good material”

What buyers complain about

Quality-Overall28%

“however unable to upload for some reason as these would show the disgraceful quality of the product”

Shape/Style22%

“Cane folded into thirds so hat does not keep its shape at all”

Value For Money17%

“Not worth the money”

Size-Overall11%

“Too small”

Stitch/Finish/Polish6%

“the stitching is poor”

Material Quality6%

“Very thin material”

Durability3%

“it would probably fall apart”

Upholstery/Fabric Quality3%

“Flimsy fabric”

Top return reasons

Size-Overall71%

Quality-Overall11%

Advertised Vs Actual Product3%

Material Quality3%

Shape/Style2%

Value For Money2%

Compatibility-Overall1%

Flexibility1%

Strength1%

Defective Material/Parts1%

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.