I'll take this a step further and admit that I wear a 1-piece everytime I ride. Full ankle boots, gaunlet gloves, back protector, helmet and chest guard. Now you may not need to take it to that extreme but I feel comfortable wearing all that. If you get a perforated leather jacket you shouldn't be too bad, sweat wise. My A* suit flows air pretty well and only sometimes do my legs start sweating. I'd rather be in full gear than a cast.