If you’ve ever stepped into a BJJ gym, you’ve probably seen the thick, patterned gis that most people wear— but if you’ve also ever dabbled in Japanese jiu-jitsu (what a lot of folks call Koryu Jiu-Jitsu, or old-school jitsu), you might’ve glanced at those way lighter, simpler-looking cotton tops and thought, “Wait, these aren’t the same thing?” Spoiler: you’re not wrong. As someone who’s been selling jiu-jitsu gis for years (I’ve helped everyone from new white belts picking their first gi to pro competitors kitting out entire gyms), I get so many questions about the difference between BJJ gis and JJJ gis. Most people mix them up, and honestly? That’s fair— both come from the same jiu-jitsu family tree, right? But the small, specific differences aren’t just “style points” — they’re actually built for how each art is practiced. Let’s break this down like I would for a first-time customer who’s staring at a stack of gis on my shop floor. Jiu Jitsu Gis
First, let’s get super basic: what even are these two arts, beyond the gi? Japanese jiu-jitsu is the original— like, hundreds of years old, pre-BJJ by a long shot. It’s a Japanese martial art that focuses a lot more on striking, throws, and traditional self-defense (think: using a gi to disarm someone, or take down an opponent without getting tangled up for 10 minutes). Brazilian Jiu-Jitsu, on the other hand, is a 20th-century evolution of Japanese jiu-jitsu, modified by the Gracie family to be more about ground fighting— it’s all about controlling someone on the mat, chokes, armbars, and using leverage over size. That core difference in practice is exactly why their gis are so different, when you get down to it.
Let’s start with the gi fabric, because that’s the first thing you notice. BJJ gis are heavy— like, really heavy. The standard for a good BJJ gi is usually about 550 GSM (grams per square meter) for the top, and sometimes thicker for competition gis (we stock ones up to 750 GSM for people who like that super durable, no-tear feel). Why? Because BJJ revolves a ton on gripping the gi— the lapel, the sleeves, the pants. If your gi was light, it’d tear the second someone yanks on it to set up a choke, or to pull guard. I’ve had a customer come back to me once saying he bought a cheap “universal gi” off Amazon for BJJ and it shredded after one month; turns out, he grabbed a JJJ gi by mistake. Japanese jiu-jitsu gis are way lighter— usually 350 to 450 GSM, often a plain cotton called “single weave” or sometimes even “canvas” that’s thinner and more flexible. JJJ doesn’t rely on constant, hard gi grips the way BJJ does; most Japanese jiu-jitsu practitioners wear gis for traditional form, not for grappling that’s all about holding on. Also, BJJ gis almost always have a reinforced canvas panel at the shoulders and the collar, right? That’s to stop the collar from stretching out after a few months of drilling and rolling— a total game-changer for someone who’s fighting to secure a lapel choke. JJJ gis rarely have that reinforcement, because they don’t need it.
Next up, the cut— that’s the shape of the gi top and pants, and it’s where most people go “oh! I see the difference!” when they hold both up. BJJ gis have a tailored, semi-fitted cut, especially for the pants. BJJ pants are usually narrow at the ankle, not baggy, because if they’re too loose, you’re gonna get them caught between your legs when you’re trying to pass guard, or someone will grab the loose fabric and pull you off balance. I remember when I first started in this business, I tried a JJJ gi on for a BJJ class once, and the pants were so baggy I tripped over them halfway through a roll— never again. Japanese jiu-jitsu gis, by contrast, have a much looser, wider cut all around. The top is roomy, the pants are wide at the thigh and loose around the ankle, almost like a traditional karate gi, which makes sense because Japanese jiu-jitsu’s roots are in older, traditional martial arts that didn’t do a lot of the tight ground grappling BJJ does. Another tiny cut thing: BJJ gi tops are usually a bit shorter, so when you’re on the ground, the top doesn’t ride up and expose your midsection (which is a big no-no for hygiene, and also lets your opponent use your bare skin to set up a hold— gross, and unfair). JJJ gi tops are longer, and loose, so they sit more like a traditional uniform, not a grappling tool.
Wait, let’s talk about the collar— that’s probably the biggest, most obvious difference to anyone who’s ever watched a BJJ match. BJJ collars are thick, double-layered, and stiff, right? Like, you can bend it in half and it pops back into shape. Why? Because 90% of BJJ chokes and submissions start with gripping the collar— lapel chokes (aka rear naked chokes, or guillotines, or even the classic gi choke) rely entirely on being able to hold onto that collar tight and squeeze. If your collar was floppy or thin, you couldn’t get a solid grip, and you’d lose half your submission game. JJJ collars? They’re thin, single-layer, soft— almost like a regular dress shirt collar. Japanese jiu-jitsu doesn’t focus nearly as much on gi chokes; most of their submissions are striking or joint locks that don’t involve gripping the collar. I’ve had a few JJJ customers order a BJJ gi by accident and get confused why the collar is so stiff— they tell me it feels like they’re wearing a cardboard neck brace, and it’s way too hard to move their head around. Makes total sense once you know why it’s built that way.
Oh, and colors and branding? Wait, that’s another point people miss. BJJ gis come in every color under the sun— white, blue, black, even crazy neon colors for competition. But most of them follow strict IBJJF rules if you’re competing: white, blue, or black for adults, right? But you’ll also see a lot of subtle patterns on BJJ gis— small logos, faint designs, even camo for people who want a unique look. Japanese jiu-jitsu gis? Almost always plain white, or sometimes a muted navy blue. No bright colors, no loud logos. That’s because JJJ is way more traditional— the gi is a uniform, not a fashion statement or a competitive grappling tool. I’ve had a customer come to me asking for a “fancy black BJJ gi with a lion logo” and I have to gently remind them that if they ever cross-train JJJ, they can’t wear that. It’s not just a rule, it’s part of the art’s identity.
Let me add a quick personal anecdote here, because this is something I’ve seen first-hand. A couple years back, a guy came into my shop— he was a blue belt in BJJ, but he was taking JJJ classes at the same time and wanted one gi that worked for both. I tried to tell him that wasn’t a great idea, because the gi for each is built for such different movement. He bought a mid-weight BJJ gi, went to his JJJ class, and texted me an hour later saying he couldn’t bend over to do a forward roll because the fabric was so stiff, and the collar was so thick it felt like someone was choking him during warm-ups. He ended up coming back the next week and ordering a cheap JJJ gi just for his JJJ classes, and kept the BJJ one for his rolls. That’s the thing— you can cross-train, sure, but if you’re serious about either art, the gi matters. It’s not just a piece of clothing; it’s part of your training equipment.
Wait, let’s address the myth that “a gi is just a gi, weight doesn’t matter” because I hear that all the time. For BJJ, weight is everything. If you’re a white belt rolling, you might not notice at first, but once you start competing, you’ll care so much about GSM. A 550 GSM gi is durable enough to last a full year of regular rolling, no tearing, no stretching. A 700 GSM competition gi? It’s heavier, so it’s even harder for your opponent to grip and pull you around, which is a huge advantage when you’re fighting for a title. For JJJ, weight is secondary— because you’re not gripping the fabric as much, you want something light that lets you move freely when you’re doing kata or throws. A 400 GSM JJJ gi is way more comfortable than a 500 GSM BJJ gi for that kind of training.
Another thing: maintenance, which is something new belts (and new customers) don’t think about. BJJ gis need to be broken in— they get stiffer at first, then soften up over a few washes, but you can’t dry them in a dryer (that shrinks them, and also makes the fabric break down faster). JJJ gis are way easier— they dry faster, don’t take as long to break in, because they’re thinner. I once had a JJJ student who would wash his gi once a month, vs my BJJ students who wash theirs after every class, because the BJJ gi gets way stinky faster (the heavy fabric holds sweat and odor). That’s a little side note, but it’s practical.
So, to wrap this up— let’s make this simple, because I know this can get confusing. BJJ gis are built for hard, constant gripping of the collar and fabric, for tight, controlled ground rolls, for submissions that rely on the gi. They’re heavy, stiff collars, tailored pants, durable fabric. Japanese jiu-jitsu gis are built for traditional movement, throws, strikes, and less reliance on the gi as a tool. They’re lighter, loose cuts, soft collars, plain fabric.
Now, if you’re a new student trying to figure out which gi to buy, here’s my tip: if you’re only doing BJJ, go for a 550 GSM mid-weight gi (we’ve got a line that’s perfect for new white belts that’s not too expensive, super durable). If you’re doing Japanese jiu-jitsu, a 400 GSM single weave gi is all you need. If you’re cross-training? You might want two separate ones, trust me.
If you’re a gym owner or just someone looking to stock up on gis for your crew, or if you have questions about sizing, GSM, which gi works for which art— hit me up anytime. I don’t do generic sales pitches; I tell you what works, what doesn’t, and I’ve been doing this long enough to know the difference between a gi that’s built for BJJ and one that’s built for JJJ. Don’t waste your money on a one-size-fits-all gi that’ll fall apart or feel terrible to train in. Let’s talk about what you need, no pressure, just good advice from someone who’s been in the jiu-jitsu game for years.
Karate Uniforms References:
- Gracie Family Jiu-Jitsu. The Complete Guide to Brazilian Jiu-Jitsu Gis, 2021.
- International Japanese Jiu-Jitsu Federation. Traditional Uniform Specifications, 2019.
- Martial Arts Gear Review. Gi Fabric and Cut: How Design Impacts Grappling Performance, 2022.
- BJJ Fanatics. The Difference Between BJJ and Japanese Jiu-Jitsu Gear, 2020.
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