What is a kigurumi? The onesie explained

If you have landed here, someone has probably shown you a photo of a person dressed as a very comfortable dinosaur and used a word you did not recognise. So, plainly: a kigurumi is a hooded, one-piece fleece suit, usually styled as an animal or a character, designed to be worn indoors for hours at a time.

That is the whole idea. Everything else is detail, but the detail is what decides whether you enjoy wearing one.

Where the word comes from

Kigurumi is Japanese. It is built from kiru, meaning to wear, and nuigurumi, meaning a stuffed toy. Wearing a stuffed toy. It is one of those words that stops being strange the moment you translate it.

In Japan the term originally described full-body character costumes, the kind worn by mascot performers at theme parks and events. The version that reached the UK is the softer descendant of that: a fleece suit with a hood, ears, a face on the hood and a full-length zip, made to lounge in rather than to perform in. It moved from Japanese street style into British bedrooms and student halls in the late 2000s, and it never really left.

Kigurumi or onesie?

In the UK the two words are used almost interchangeably, and we do the same. If you want a distinction that actually helps:

• Onesie is the broad British word for any all-in-one loungewear suit, including plain ones in a single colour.
• Kigurumi usually means the character version, with a hood that has ears, a face, a tail or all three.

Every kigurumi is a onesie. Not every onesie is a kigurumi. Nobody will correct you either way.

What one is actually made of

The material does most of the work. Ours are polar fleece, a brushed polyester knit, and there is a good reason the whole category settled on it. Fleece is warm without weight, it does not need ironing, it dries fast, and it forgives a great deal of sitting on sofas. A cotton version of the same garment would be heavier, colder when the heating goes off and considerably more creased.

The other component that matters more than you would expect is the zip. A one-piece garment lives and dies by its zip, because you open it every time you want to use a bathroom, and a cheap one will fail long before the fabric does. Ours are YKK for exactly that reason.

Beyond that, the things worth checking on any kigurumi before you buy:

• Feet. Some designs have closed feet built in, some finish at the ankle. Closed feet are warmer; open ankles let you wear your own slippers and are easier to size.
• Hood weight. A hood with a lot of structure looks better in photos and is less comfortable to lie back in. It is a genuine trade-off, not a flaw.
• Sleeve and leg length. A one-piece cannot be adjusted the way separates can, so length is the thing that decides fit. Our onesie size guide goes through this properly.

Who they actually suit

We would rather you bought one that gets worn than one that gets photographed once. In our experience a kigurumi lands well if:

• You are cold at home in the evening and would rather not put the heating on for one person.
• You want something for sleepovers, film nights, hen and stag weekends, festivals or Christmas morning.
• You already own a dressing gown and are quietly annoyed that it falls open every time you move.

It lands badly if you want something to answer the door in, or if you run hot and already sleep with a window open. Fleece is warm. That is the point, and it is also the limit.

Can you sleep in one?

Yes, and most people who own one do. A kigurumi is cut loose, so nothing digs in when you roll over, and there is no waistband to ride up. If you sleep warm, look for a design with open ankles and sleep with the hood down, or you will wake up at 3am and unzip yourself in a temper.

Are they only for adults?

No. The category runs from baby sleepsuits through children's sizes to adult 3XL, and the children's versions are the reason a lot of households end up with three of them. Matching adult and child sets are a Christmas morning fixture in the UK for a reason.

How a kigurumi compares to the alternatives

If you are choosing between a onesie, a dressing gown and one of those wearable hoodie blankets, they solve genuinely different problems. A dressing gown is easy to get in and out of and does nothing for your legs. A hoodie blanket is the warmest of the three and useless the moment you stand up. A kigurumi is the one you can walk around the house in. We have written a full comparison in onesie vs dressing gown vs hoodie blanket.

Looking after one

Fleece stays soft for years if you keep it away from two things: heat and fabric conditioner. Wash cool, skip the softener, and dry gently. That is most of it, and the reasoning behind each step is in how to wash a onesie without ruining the fleece.

The short version

A kigurumi is a hooded fleece one-piece with a character on it, descended from Japanese costume culture, adopted enthusiastically by the UK, and worn mostly by people who are cold and want to stay on the sofa. If that sounds like a description of your evenings, browse the collection and pick a face you would not mind seeing in the mirror.

Not sure what size you are? Start with the size guide. If you do get it wrong, our 30-day free returns cover the swap.