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Great quality kids onesies.
We stock onesies for everyone.


About Our Onesies

At Kids Onesies, we stock a wide range of onesies available in bright colours, unique designs and fun themes. We sell adults designed for everyone, form young children to adults - our onesies are for everyone.

Why should I buy a onesie?

Onesies are a popular option for people of all ages. They are comfy and cosy, and you can find a design that reflects your personality or passion, match with your dog in a puppy themed onesie, or a set of matching family onesies for the annual Christmas photo.

They are easy to pop on without worrying about trying to find top and bottoms, and provide optimum comfort. Compared to a nightgown or pyjama set, onesies are often made of a fleece material and usually include a hood, keeping you warm from head to toe.

Affordable and always a hit, a onesies is a great choice for lounging around the house, sleepovers and also make great fancy dress or Halloween costumes.

What sizes do onesies come in?

Our onesies come in a range of sizes designed for kids ages 18 months to 15 years, a range of women's sizes and a range of men's sizes. Click below to view our sizing charts.

How are onesies meant to fit properly?

Its important to remember that our size charts are based on your measurements, not the measurements of the onesie or pyjama set. If you fall between two sizes of onesie, we advise that you size up to ensure that you can feel comfortable. We also recommend that you order a size up for children, this means they can wear their onesie for longer and can grow into it.

How do I choose the right style of onesie?

If you're looking for something that is bold and a statement piece, you might want to consider an animal themed onesie, such as a dragon or a lion. If you're looking for something with more flexibility, you could look at our range of plain onesies, available in a range of colours. These are more inconspicuous and you may be able to get away with wearing them outside of the house.

How do I choose the right fabric for my onesie?

Personal preference has a big impact on your purchase decisions, for example, if you tend to feel warm most of the time, choosing a cotton, footless onesie might be better for you. For those looking for a more toasty option, a fleece onesie with a hood and feet covers will help you warm up more quickly.

Onesie Washing & Care

How do I wash and look after my onesie?

We always recommend checking the specific washing instructions on the label of your onesie. For most onesies, we recommend washing turned inside out on the first cycle with similar coloured clothes or fabrics. There may be dye bleeding in the first wash, so ensuring that you are washing with similar colours will prevent accidentally dying other clothing.

  • Wash at 30 degrees
  • If using a tumble dryer, use a gentle setting
  • Air drying prevents any shrinkage and allows you to reshape after washing

About Kids Onesies

What if a product I want to buy is out of stock?

 If the product you would like to buy is not in stock, we recommend signing up to our newsletter so that you can receive updates on restocked items and new lines. If you are looking for a specific product and are unable to get it in the size or style you need, please contact our team who will be happy to advise you further.

What is your returns policy?

If you receive an item that is unsuitable, the wrong size or doesn't meet your expectations, you can receive a full refund when returned within 30 days from the date of dispatch. Please ensure you include your returns slip, or details of your order including your name, address, order number, reason for return and your preference on refund or exchange.

If you receive a faulty product, please get in touch with our customer service team on who will be able to help you resolve your problem and provide you with details of next steps.

We advise you to use a recorded delivery service when sending the item(s) back.

The address for the returns is:
Kids Onesies c/o The Clothing Outlet
Richardshaw Road
Grangefield Industrial Estate
LS28 6QW

For more information, please email our team on

For more information on our returns process, click here.

Will my postage fees be refunded?

Return postage fees cannot be refunded unless the reason for the return of the goods was due to an error made by us. If the error is ours we will then refund postage costs up to a maximum of the postage price you originally paid on your order.

How long does it take to be refunded?

Please allow 5-10 days for refund to be processed and refunded to your card. We will send you an email to let you know when the refund has been processed.

How do I make a complaint?

In the first instance please send all of the details of your complaint to our email address

How do I contact the Kids Onesies team?

Simply email or call using the details below:

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