Loading blog content, please wait...
By Pinnacle Martial Arts San Antonio
Every Gi Question We Get from Adults Starting Jiu Jitsu > Quick Answer: You don't need a gi before your first class—show up in athletic wear and try it ...
Quick Answer: You don't need a gi before your first class—show up in athletic wear and try it out. If you continue training, invest in a quality pearl weave gi that fits your height and weight range. Wash it after every session to maintain mat hygiene and respect for training partners.
A gi is the traditional uniform worn in jiu jitsu — a heavy cotton jacket, drawstring pants, and a belt that indicates rank. If you're an adult stepping onto the mat for the first time in 2026, the gi is probably one of the first things you'll wonder about: what it is, whether you need one right away, and how to pick the right one. This guide covers the exact questions adults ask us most often so you walk in feeling prepared, not confused.
Our school focuses on jiu jitsu and MMA training for kids and adults in San Antonio, and we work with beginners every single week. These gi questions come up in almost every free VIP tour and trial class conversation — so if you're wondering, you're in good company.
No. You don't need to buy a gi before you try a class. Most people show up in athletic shorts or sweatpants and a fitted t-shirt for their first session, and that's completely fine. We'd rather you come as you are than delay getting on the mat because you're overthinking gear.
If you decide to stick with training — and many people do after even one class — then investing in a gi makes sense. But there's zero pressure to buy anything before you've had a chance to see whether jiu jitsu feels right for you.
A jiu jitsu gi is a reinforced cotton uniform designed to withstand gripping, pulling, and constant friction. The jacket (or kimono) is woven thicker than a standard martial arts uniform, and the pants use ripstop or drill cotton to hold up during ground work.
Quality matters more than brand name. A poorly constructed gi will shrink unpredictably, tear at the seams within a few months, and feel uncomfortable against your skin during a hard roll. A well-made gi from a reputable manufacturer — even a mid-range one — will last years with proper care.
Three things to check before you buy:
Gi sizing uses a letter-number system (A1, A2, A3, etc.) that doesn't match standard clothing sizes. An A2 in one brand might fit like an A3 in another, so trying on before buying is always the safest route.
Here's a general reference:
| Gi Size | Height Range | Weight Range | |---------|-------------|--------------| | A1 | 5'4"–5'7" | 130–150 lbs | | A2 | 5'7"–5'10" | 150–180 lbs | | A3 | 5'10"–6'1" | 180–210 lbs | | A4 | 6'1"–6'4" | 210–240 lbs |
These are rough guides. If you fall between sizes, most people size up and then wash in warm water to shrink slightly. We're happy to help you figure out sizing during your trial class or VIP tour — just ask.
Technically, you can wear a karate or judo gi to your first class. Nobody's going to send you home. But jiu jitsu gis are built differently — the jacket is cut shorter so it stays tucked during ground work, the collar is thicker to resist gripping, and the pants are reinforced at the knees because you'll spend a lot of time there.
A karate gi is thinner and designed for standing techniques. It won't hold up to regular jiu jitsu training. If you already own one, it's fine for day one. Just plan to transition once you're committed.
Yes. Every single time. A gi absorbs sweat, skin cells, and bacteria during training. Washing after each session isn't optional — it's basic mat hygiene and a sign of respect for your training partners.
Cold or lukewarm water protects the fabric and prevents excessive shrinking. Hang dry when possible. The CDC's guidelines on hygiene for contact sports recommend washing athletic clothing after every use, and gis are no exception.
Most adults who train two to three times per week find that owning two gis makes laundry logistics much easier.
No-gi jiu jitsu uses a rashguard and athletic shorts or spats instead of the traditional uniform. Our school offers both gi and no-gi training because each develops different skills. Gi work emphasizes grip fighting and technical precision. No-gi training tends to be faster-paced and translates more directly to MMA.
Many adults start with gi classes because the grips slow things down and make techniques easier to learn. Others prefer no-gi from day one. Neither choice is wrong — it comes down to what feels natural to you.
Worrying about the uniform is normal, and it's one of those small barriers that keeps people from walking through the door. Our approach is simple: come as you are, ask whatever questions you have, and let us take care of the rest. We pride ourselves on customer service that no other school in San Antonio can match, and that starts before you ever buy a gi.
Book a free VIP tour or sign up for a trial class. We'll walk you through everything — gi questions included — so you can focus on what actually matters: learning jiu jitsu.