Sexy Halloween costumes UK 2026: wicked, not tacky
Ten sexy Halloween costumes from £12.49: gothic gowns, a vampire queen, a corset and cape, and a sleek catsuit. UK prices checked 10 Oct 2026. 18+.
Halloween is the one night a year you get to be exactly as wicked as you like, and nobody asks why. The trick is looking dangerous, not like a bargain-bin party bag. These ten costumes lean dark and dramatic: gothic gowns, a vampire queen, a corset with a cape and one very sleek catsuit.
All ten are from Smiffys, the UK fancy-dress maker, and run from £12.49 to £46.99. Prices and sizes come from the retailer’s own listings, checked 10 Oct 2026. Stock moves fast in October, so if a size you want is showing, don’t sit on it.
The edit at a glance
Under £20: wicked on a budget
Budget pick
1. Fever Devilish Costume
£12.49 (was £23.99; sizes S and L. M is £25.49) · Price checked 26 Oct 2026
Best for: Head-to-toe red heat for the price of a round
- Five pieces: red pentagram-print mini dress, horns headband, choker, bat wings and long gloves
- UK sizes 8–18 (M was out of stock when we checked)
- Polyester
2. Midnight Vamp Costume
£15.49 · Price checked 26 Oct 2026
Best for: Long, black and dangerous, with zero effort
- Long-sleeved black maxi dress with a V-neck, jagged flared cuffs and a fishtail hem
- Rear tie detail
- UK sizes 8–22 (Plus X1 was out of stock when we checked)
3. Fever Sexy Reaper Costume
£16.49 (Plus X1 on sale at £6.99) · Price checked 26 Oct 2026
Best for: Dark, hooded and a little bit deadly
- Black hooded mini dress
- Trailing mesh sleeve extensions and a jagged hem
- UK sizes 4–22 (L was out of stock when we checked)
4. Wickedest Witch Costume
£19.99–£22.49 (by size) · Price checked 26 Oct 2026
Best for: The classic witch, all in black, no shopping list
- Dress, underskirt and hat
- Sizes S–XXL (XXL was out of stock when we checked)
- By Rubies
£20–£35: the sweet spot
Top pick
5. Vamped Costume
£28.79 (was £33.98) · Price checked 26 Oct 2026
Best for: A vampire look that’s more lingerie than gown
- Plunge teddy in foiled mesh with a removable collar
- Sizes S/M–L/XL, plus 1X/2X and 3X/4X
- Close alternative to the Queen of the Vampires gown
6. Fever Red Riding Hood Costume with Corset
£30.99 · Price checked 26 Oct 2026
Best for: A fairytale with a wicked streak
- Corset dress and hooded red cape
- UK sizes 8–18
- Polyester
7. Fever Evil Queen Costume
£31.49 · Price checked 26 Oct 2026
Best for: Black, gold and in charge
- Full-length black and gold dress with structured shoulders
- UK sizes 4–14
- Sponge clean only
£35 and over: the full statement
8. Spellbound Witch Costume Set
£36.67 (was £43.30) · Price checked 26 Oct 2026
Best for: A witch that works as lingerie after the party
- Strappy pentagram bralette, cutout panty, skirt and hat
- 3X/4X plus-size version available
- Close alternative to the Fever Gothic Dream
For him
9. Fever Male Vampire Costume
£44.99 · Price checked 26 Oct 2026
Best for: His half of a vampire double act
- Sweeping cape, red crushed waistcoat and cravat
- Shirt and trousers aren’t included, so wear your own black ones
- Chest 38–44 in (M and L)
Premium pick
10. Feral For You 4-Piece Cat Costume Set
£36.20 (was £42.74) · Price checked 26 Oct 2026
Best for: A cat look built on lingerie, in plus sizes
- Crotchless lace teddy, harness, cat-ear headband and eye mask
- Plus Size 1X/2X
- Close alternative to the Catwoman costume
Compare at a glance
| Look | Costume | Price | Link |
|---|---|---|---|
| Devil, done properly | Fever Devilish Costume | £12.49 | Shop |
| Gothic gown | Midnight Vamp Costume | £15.49 | Shop |
| Short and hooded | Fever Sexy Reaper Costume | £16.49 | Shop |
| Classic witch | Wickedest Witch Costume | from £19.99 | Shop |
| Vampire lingerie | Vamped Costume | £28.79 | Shop |
| Corset and cape | Fever Red Riding Hood Costume with Corset | £30.99 | Shop |
| Dark queen | Fever Evil Queen Costume | £31.49 | Shop |
| Strappy witch | Spellbound Witch Costume Set | £36.67 | Shop |
| His vampire | Fever Male Vampire Costume | £44.99 | Shop |
| Lingerie cat | Feral For You 4-Piece Cat Costume Set | £36.20 | Shop |
Prices from smiffys.com, checked 10 Oct 2026. Some prices change by size, and stock moves fast in October, so check the retailer page before you buy.
Wicked, not tacky: how to choose
- Pick one colour story. Black with red or black with gold looks deliberate. Five clashing colours look like a party bag.
- Length is a choice, not a rule. A floor-length gown with a high collar can turn more heads than a mini. Go with whatever makes you walk in like you own the room.
- Read the “includes” line. Some costumes are complete (the devil set has five pieces). Others are just the dress, or, for his vampire, just the cape, waistcoat and cravat.
- Size up for layers. Fancy-dress fabric has less stretch than your own clothes. Check the retailer size guide, especially for one-size pieces.
- Going as a pair? The Midnight Vamp or the Vamped Costume with his Male Vampire makes an easy double act.
More for the night: fancy dress & roleplay · date-night lingerie · date-night kits. 18+ only.
