Edinburgh in late October rarely does anyone’s favours: the wind off the Forth cuts straight through a thin costume, and half the fun of Halloween here is the walk between pubs on Cowgate or the queue outside a house party in Marchmont. That’s exactly why onesies have become the go-to costume for students and families alike: warm enough for the walk, silly enough for the party, and comfortable enough to collapse into on the sofa afterwards. To put this list together, we checked which UK shops actually stock Halloween-themed onesies right now, how fast they can get an order to Scotland before the 31st, and whether their sizing runs wide enough for a real range of body types. Ten shops made the cut.
1. Escapade
Escapade has been outfitting UK Halloween parties for well over three decades, and it shows in the sheer depth of the catalogue. Thousands of costumes and accessories alongside a solid onesie section. It’s a strong pick for anyone who wants their onesie to sit inside a bigger costume plan, since you can grab face paint, wigs or props from the same basket. The shop is based in London, so Edinburgh shoppers are ordering online rather than popping in, which means it’s worth checking dispatch times if Halloween is only a few days away. For a flat-share planning a themed night where everyone needs a different creature, Escapade’s range makes it easy to find ten different animals without hunting across ten different sites.
2. SillySanta
SillySanta’s Halloween onesies collection is built around comfort first, costume second: fleece and flannel pieces with oversized hoods and a relaxed cut rather than the stiff, itchy suits some Halloween ranges default to. That makes it a natural fit for the kind of Edinburgh night where you’re moving between a costume party and just staying warm on the walk home along George Street. The range covers men’s, women’s and kids’ sizing, so it works for a family doing trick-or-treating together as easily as it does for a couple coordinating a matching look. One thing to flag: because the styles lean cosy rather than elaborate, it’s not the shop to pick if you want a highly detailed character costume rather than a soft, wearable one. For a group of friends who’d rather be comfortable than perfectly in-character, it’s an easy first stop.
3. AnyCostume
AnyCostume is actually based in Edinburgh, with a shop on St Patrick Square that Southside and Newington students have relied on for years, plus an online store covering the rest of the country. That local presence is genuinely useful if your onesie order goes wrong or you decide two days before Halloween that you need a different size. You can walk in rather than wait on a returns label. Stock includes costumes, accessories and a onesie selection, though the range of onesie styles specifically is narrower than shops that specialise in nothing else. It suits last-minute Edinburgh shoppers more than anyone planning weeks ahead, since the real advantage here is proximity, not the biggest catalogue in the country.
4. Party Delights
Party Delights bills itself as the UK’s largest online party and fancy dress retailer, and the scale is obvious once you start browsing: decorations, tableware and costumes all under one roof, with next-day delivery on orders placed before 4 pm. That speed matters for anyone in Edinburgh who’s left costume shopping until the week of Halloween itself, which, if we’re honest, is most people. It’s also a sensible choice if one person is organising onesies for an entire group, since ordering costumes and party decorations together in a single checkout saves both time and delivery costs. The trade-off is that the onesie selection sits inside a much bigger site, so it takes a bit more scrolling to find than it would on a shop that only sells onesies.
5. Fancydress.com
Fancydress.com runs a dedicated Onesies & All-in-One Costumes collection that spans animals, Halloween characters and beyond, with next-day delivery advertised across the site. Because the whole collection is unisex, it’s genuinely handy for mixed groups or couples who want to buy from the same page rather than hopping between men’s and women’s sections. Where it stands out is the variety of themes. You’re not limited to spooky designs, so if someone in your group would rather be a dinosaur than a ghost, that’s covered in the same order. The main thing to watch is fit: reviews suggest sizing can run generous on some styles, so it’s worth checking the size chart on each product rather than assuming the same size across the range.
6. Joke.co.uk
Joke.co.uk keeps its onesie range simple and practical, with next-day delivery and a spread that runs from baby Halloween onesies right up to adult sizes. That full-family coverage is the real selling point. If you’re taking younger kids trick-or-treating around Marchmont or Bruntsfield and want everyone, baby included, in a matching theme, this is one of the few shops that actually stocks all the age brackets in one place. The zip-up, hooded construction is aimed squarely at speed and ease rather than intricate detail, which is exactly what you want when you’re dressing three children in a rush on the 31st. It’s a less obvious pick for adults after something more elaborate, since the adult range is smaller than the kids’ and baby selections.
7. HalloweenCostumes.co.uk
This is the UK arm of a much larger US costume retailer, and its Adult Onesies category is built for browsing by size and budget, with filters for plus sizes and regular sale pricing. That makes it a good option for anyone who’s struggled to find their size elsewhere. The plus-size range is more clearly signposted here than on several smaller UK sites. Own-brand “Made By Us” pieces sit alongside licensed designs, so there’s a genuine spread of price points from budget to premium in the same search. Because it’s the UK outpost of an American brand, it’s worth double-checking delivery estimates against your Halloween date rather than assuming next-day as standard.
8. Funidelia
Funidelia operates across several European markets, including a dedicated UK site, and its onesie and kigurumi section leans further into character variety than most UK-only shops. Think Japanese-style animal kigurumi alongside more standard Halloween shapes. That makes it worth a look for anyone bored of the usual pumpkin-and-skeleton lineup and after something a bit different for a costume party in the New Town. The breadth of design is the appeal here rather than speed, so it suits shoppers ordering a couple of weeks out rather than the night before Halloween. If delivery time is tight, it’s worth checking shipping options at checkout before committing, since cross-border stock can move slower than a UK-only warehouse.
9. eBay UK
eBay is the wildcard on this list, but a genuinely useful one: search “Halloween onesie” and you’ll find both small UK-based fancy dress sellers and bulk international listings side by side, often at prices well below the dedicated costume shops. It’s a good shout for students working to a tight budget, or for anyone chasing an unusual size that’s sold out everywhere else. The catch is quality and delivery consistency vary enormously from seller to seller, so it’s worth checking that a listing ships from a UK address and has recent, genuine reviews before you buy, especially if Halloween is only days away.
10. Amazon UK
Amazon rounds out the list simply because of scale and speed. Prime delivery can get a onesie to an Edinburgh flat within a day or two, which matters when Halloween planning has, once again, been left until the last minute. The range spans everything from budget novelty onesies to pricier licensed designs, all searchable and filterable in one place. As with eBay, the quality depends heavily on which seller is fulfilling the order, so it’s worth reading recent reviews and checking the size guide rather than trusting the product photos alone, particularly for animal-print styles where cut and fabric weight vary a lot between listings.
How to Choose the Right Onesie, Shop and Size
Edinburgh’s October evenings can dip close to freezing, so fabric weight matters more here than it might further south. Fleece-lined or flannel styles will get you through a night out far more comfortably than a thin polyester one. If you’re buying for a group, decide early whether you want everyone from the same shop for a consistent look, or whether mixing sources for variety and budget makes more sense; the group-order shops on this list (Party Delights, Fancydress.com) make bulk buying simpler, while marketplaces like eBay and Amazon are better for individual, budget-driven picks.
Always check the size chart rather than the size label. Jnesie sizing is notoriously inconsistent between brands, and a size that fits one shop’s “Medium” might be closer to a “Small” elsewhere. Finally, order with buffer time: even shops offering next-day delivery can be slower during Halloween week itself, when demand across the whole country spikes at once.
Final Thoughts
None of these shops will make you look like you tried especially hard, and that’s rather the point of a Halloween onesie. Whether you’re heading to a house party in Leith or just answering the door to trick-or-treaters, the right one keeps you warm, gets a laugh, and doesn’t need much thought after the 1st of November besides where to store it until next year.
