Buying a Karate Gi – Guide to Choosing the Right Karate Uniform

Buying a Karate Gi – A Beginner’s Guide to Choosing the Right Karate Uniform

Whether you’re a parent buying your child’s first karate uniform or an adult just starting out, choosing the right karate gi can feel overwhelming. This guide covers everything you need to know — from sizing and fit to materials, cuts and care — so you can buy with confidence.

Contents

1. The Basics — What is a karate gi?
2. Sizing — How to choose the right size
3. Gi Type & Cut — Japanese vs European cut explained
4. Material, Weight, Cost & Quality
5. Brands
6. Gi Care — How to look after your karate uniform

1. The Basics — What is a Karate Gi?

A karate uniform is sometimes called by its Japanese name karate do-gi or keiko-gi (meaning training clothing), though most people outside Japan simply call it a gi (pronounced “ghee”). The same term applies to other Japanese martial arts uniforms — a judo-gi or aikido-gi, for example.

The modern gi is widely credited to Jigoro Kano, the founder of judo, and was later adapted for karate by Shotokan founder Gichin Funakoshi. Over the years the karate gi has evolved — becoming lighter, adding internal jacket ties, and developing different cuts and styles to suit different training needs.

A standard karate gi consists of a white cotton crossover jacket (uwagi), matching white trousers (zubon), and a belt (obi) corresponding to the student’s grade. Most karate clubs train in traditional white gis, though some freestyle and sport karate clubs use coloured uniforms.

A note for beginners: Many clubs allow new students to attend their first few lessons in comfortable casual clothing before purchasing a uniform. It’s always worth checking with the club instructor before buying, as some clubs or competitions may have specific requirements.

Jacket fit: The jacket should allow free arm rotation and waist movement. It should hang 4–8 inches below the belt and sleeves should finish at or just before the wrist. The left side of the jacket should always sit on top of the right — in Japanese culture, wearing it the other way is associated with death.

Trouser fit: Karate trousers need to allow full leg movement for kicks and stances. They should finish just above the feet — around 3–5 inches shorter than your leg length — and must not restrict movement around the thigh or groin.

Belt: Many karate gis, particularly higher quality ones, do not include a belt. Beginner gis sometimes come with a white belt. Make sure your belt is long enough to wrap around the waist twice and hang to roughly the bottom of the jacket when tied.

2. Sizing — How to Choose the Right Size Gi

Sizing is one of the most common challenges when buying a karate gi. Sizes vary between brands and gi types, so it’s important to use the right method.

Karate gis are typically sized using two references — a number (e.g. size 4) and a height in centimetres (e.g. 170cm). Always use the centimetre measurement rather than the size number, as the same number can mean different heights across different brands. For example, a size 4 in a Japanese-made gi may correspond to 160cm, while a European size 4 is usually 170cm.

To find your size, simply convert your height to centimetres and match it to the gi’s cm sizing. If you’re between sizes, consider your build — go up a size if you have a broader or heavier build, or down if you’re slimmer.

Typical size ranges:

Children’s sizes:

• 0000 — 100cm (up to approx. 3’6”)
• 000 — 110cm (approx. 3’6”–3’7”)
• 00 — 120cm (approx. 3’8”–4’0”)
• 0 — 130cm (approx. 4’1”–4’4”)
• 1 — 140cm (approx. 4’5”–4’8”)
• 2 — 150cm (approx. 4’8”–5’1”)

Adult sizes:

• 3 — 160cm (approx. 5’1”–5’5”)
• 4 — 170cm (approx. 5’5”–5’9”)
• 5 — 180cm (approx. 5’10”–6’0”)
• 6 — 190cm (approx. 6’1”–6’3”)
• 7 — 200cm (approx. 6’4”–6’7”)
• 8 — 210cm (6’7” and over)

Shrinkage: Pure cotton gis can shrink by 4–8% (sometimes up to 10% on lower-cost gis), mostly on the first few washes. If a gi feels slightly large when first tried on, this can be acceptable — sleeves and hems can also be taken up if needed. However, if it’s significantly too large, exchange it before washing as gis cannot be returned once washed. Poly-cotton and polyester gis shrink considerably less, making them a practical choice for children.

You can view individual size charts for our karate gis in each product listing. We stock a wide range of karate gis for adults and children to suit all levels.

3. Gi Type & Cut — Japanese vs European

There are two main karate gi cuts to be aware of:

Japanese cut — shorter sleeves and trousers with a longer jacket. This is the traditional style and is often preferred for kata (pre-arranged forms). Kata-specific gis are an exaggerated version of this cut, designed to give a crisp, sharp appearance during performance.

European cut — longer sleeves and trousers, often lighter in weight. This cut is more commonly associated with kumite (sparring) gis, which prioritise freedom of movement and agility.

In practice, a good quality gi of either cut will be suitable for general karate training. If you’re buying for a child or beginner, a standard club gi will cover all aspects of training. If you’re buying for competition, check the specific requirements of the competition or governing body (such as the WKF) before purchasing.

You may also see gis described as tournament or traditional — these terms can overlap with Japanese and European cuts and are sometimes used inconsistently between brands. As a general rule: if the sleeves and trousers are shorter with a longer lapel, it’s closer to a Japanese/kata cut; if the sleeves and trousers are longer and the gi is lighter, it’s closer to a European/kumite cut.

4. Material, Weight, Cost & Quality

Karate gis are available in a range of materials and weights. Here’s a breakdown to help you choose:

Materials:

• Cotton — the traditional choice. Durable, breathable and preferred by many experienced karateka. Cotton gis do shrink more than synthetic alternatives, though pre-shrunk options are available.
• Poly-cotton / Polyester — lighter, less prone to shrinkage and generally more affordable. A practical choice for beginners and children.
• Brushed cotton — softer and more comfortable, often used in lighter gis.
• Canvas — stiffer and more durable, giving techniques a satisfying snap. Common in heavier, higher-quality gis.

Some premium gis now use advanced fabrics with moisture-wicking or ventilation features (such as adidas Climacool technology), which can be beneficial during intensive training.

Weight categories:

• Lightweight (4oz–8oz) — ideal for beginners, children and kumite. Affordable and easy to move in, though the material can be thinner.
• Middleweight (9oz–12oz) — more durable than lightweight gis. Suited to intermediate students or those who prefer a slightly lighter gi.
• Heavyweight (14oz–16oz) — made from heavy drill cotton, canvas or double weave. Preferred by advanced students. More expensive but significantly more durable and long-lasting.

As a general guide, beginners and children are best suited to a lightweight poly-cotton gi, while more experienced students often prefer a heavier cotton gi for its durability and feel.

5. Brands

There are many karate gi brands available, each offering different quality levels and sizing. Here are some of the most respected names in the karate community:

• adidas — one of the most widely recognised brands in karate. Their range covers everything from beginner club gis to WKF-approved competition gis such as the adidas Champion and adidas Adi-Zero.
• Cimac — a trusted UK brand offering excellent value across beginner and advanced gi ranges.
• Arawaza, Tokaido, Shureido, Seishin International — high-end brands with a strong reputation among advanced and competition karateka. Some offer custom fit options.
• Hayabusa, Meijin, Tokon — well regarded within the karate community for quality and performance.

Sizing can vary between brands — some brands run slightly more generously than others — so always refer to the individual size chart for each gi rather than relying on the size number alone.

6. Gi Care — How to Look After Your Karate Uniform

A well-cared-for gi will last significantly longer. Follow these guidelines to keep yours in good condition:

Washing:

• Wash your gi as soon as possible after training — don’t leave it damp in a bag.
• Turn the gi inside out before washing.
• Use cold or lukewarm water — never above 30–40°C.
• Use a non-bio or gentle detergent where possible.
• Do not use bleach, vinegar or bicarbonate of soda — these can weaken the fabric and cause discolouration.

Washing your belt: Some karateka prefer not to wash their belt, particularly black belts, as a mark of respect for the grade achieved. If you do need to wash it, hand wash carefully and dry naturally. Avoid washing machines and tumble dryers, and take extra care with silk or satin belts.

Drying:

• Always air dry — hang outdoors or near a radiator.
• Never use a tumble dryer, as this will cause shrinkage and damage the fabric.
• You can iron the gi inside out once dry, avoiding any embroidery or printed patches.

Storage:

• Hang your gi in a dry, ventilated space when not in use.
• Avoid screwing it up in a bag after training — fold it carefully along the seams or use the traditional shikaku no gi (square fold) or maki no gi (roll fold) methods when transporting it.

This guide is based on experience from karate training and working as a martial arts retailer. For personalised advice on choosing the right gi, feel free to contact us — we’re happy to help.

Browse our full range of karate gis and uniforms at Budo Online.