Ok, Leather jacket measurements and how to measure: Do NOT give me shirt sizes, and don't give me your actual body measurements unless you're also giving me a jacket size as they're going to be two totally different measurements. I'm putting measurement examples here as a guideline so you can ask yourself yes/no if it will fit on you or not. Also, I have no idea what BoO fits like, or any other brand really, so don't base sizing on that. A good way to start is to find a good fitting jacket you own and like the fit of, and start by taking shoulder to shoulder and pit to pit, and sleeve circumference measurements using a soft tape measure, being sure not to bunch the fabric any. From there, put the jacket on, figure out exact sleeve and body lengths you will need, and the adjustments you'd make for something slim fitting like a leather jacket. All of the jackets measured out fairly similarly, the Moto sample might've been made into a size too big for me, but they're all pretty similar. I will call the sample sizes for the Double Rider's and the A2 a 46 and then from the measurements I list here, you can calculate up and down, each full size (44,45,46,47,48,49,50,51) is 2.5% apart. I will call the Moto a 48 with 46's sleeves on it. It came out funny but I know the body will fit a TOJ 48 (ie Brian SD) well. LENGTH on the sleeves and body are adjustable, and you will choose what you want, on the dot. SLEEVE WIDTH and ARM SCYE size go hand in hand, and you can bump up your sleeve up to 3 full sizes to add to the smaller body size (i.e. you are a weightlifter and you need a size 50 body with size 53's sleeves grafted on, making a '50/53 hybrid') bear in mind the stock sizing is skinny armed. Very skinny armed. If you have any kind of upper arm size on you, you will want to consider sizing sleeves up very strongly. My pit to pit, people on here in the past and people who've seen the varsity jacket chart, they've all bitched that it's too wide. I have a natural 35" chest and my TOJ jackets measure 41" around, but they are by no means too big. It is a deceiving measurement as I kick the pits out but bring the sides back in toward the waist, and I think it makes for a comfortable jacket. I can bring the pits in closer, but don't over measure yourself or it will be too small. If you refer to my fit pics; pretty much every jacket rides right on my waistband. I am not 100% normally proportioned, I am Asian. I am 175cm/57kg, very skinny, I have insanely skinny arms and legs, but fairly wide shoulders and a chest, considering my size. My upper body sizes out to something that is similar to guys about 5'11 or so, and my arms are unusually long'ish. All measurements were taken with jacket on, measuring the outside of the jacket using a regular soft measuring tape. Ok, anyway, the Double Rider's raw measurements, the sample '46' Shoulder to shoulder, front, straight across from epaulet base to epaulet base: 16.75" Shoulder to shoulder, back straight across from epaulet base to epaulet base: 16.3" Chest around at pits: 41" Mid section around: 36.5" Waist around, under belt: 37.25" Front, from top to bottom down the middle (from under collar seam) : 21" Back, top to bottom down the middle, from under collar seam: 23.5" Keep in mind that things on the torso are better when you keep things in a lock proportion and don't fiddle with stuff too much, like I said I can bring the pits in closer but it's not ideal, so don't question my pattern or measurements too much unless you know for sure it's going to work. A 'I normally wear a 19.2" p2p, your p2p is crazy' might backfire on you as the jacket will end up tight. I have a certain pattern here that has given me a lot of great results and I want to keep using it as I think it will continue to give good all-around results. My sleeve length, outer, from shoulder seam to cuff edge: 24" (this is variable and depends on your taste and needs) Sleeve circumference at pit, 14" Sleeve circumference at elbow, 12.5" Sleeve circumference at wrist, about 11.5" Keep in ming you can size up the sleeves onto a small body, and adjust lengths as necessary. For TOJ Bomber in size 46 Shoulder to shoulder, front, straight across from epaulet base to epaulet base: 16.25" Shoulder to shoulder, back, straight across from epaulet base to epaulet base: 17" Chest around at pits: 41" Mid section around: 39 Waist around, rib knit wrapped around me snug: 34" (variable obviously, and I have a true 29" waist) Front, from top to bottom down the middle (from under collar seam) to bottom of rib cuff edge : 22" Back, top to bottom down the middle, from under collar seam, same way: 24.2" My sleeve length, outer, from shoulder seam to cuff edge: 26.5" (this is variable and depends on your taste and needs) (THis jacket has rib trim so it is better to be generous and give yourself an extra inch or two more than you would on the Moto or Double Rider's) Sleeve circumference at pit, 14" Sleeve circumference at elbow, 12.5" Sleeve circumference at wrist, about 11.5" Ok... and then the Moto, in my TOJ 48 body size Shoulder to shoulder, back, straight across: 18.5" Shoulder to shoulder, front, straight across: 18.5" Chest around at pits: 42" Mid section around: 38" Waist around: 39" Front, from top to bottom down the middle (from under collar seam) to bottom of rib cuff edge : 20.6" Back, top to bottom down the middle, from under collar seam, same way: 23.25" Same sleeves as the Double Rider's. Ok... so there you have it, remember sizes up and down are 2.5% per whole number size and 5% per full 'true size' ie 46,48, 50. etc.