There is a European body called CE which makes standards for vehicles, much like our DOT. They have a standard for motorcycle clothing and protective armor. All of the suits below which feature armor are CE certified. CE armor is good stuff for protecting you in a slide, or from small impacts.
People seem to focus on the injury caused by the slide. This is not where you tend to get hurt. On a taller bike like a touring or sport touring bike, you get hurt more from the fall. The bike is tipping over at 1g, but that number relates to the bike's center of mass. Your shoulders are about three times as high up as the center of mass, so you're actually levered into the ground at 2 to 3 gs, which means the fall from like 3-5 feet above the ground is effectively more like a fall from 6-15 feet above the ground. Leather and CE padding aren't going to have much effect on this.
You see these films where GP racers go down at 100 mph and walk away. It's worthwhile to remember that they are falling from only a foot or so high - often their knee is already on the pavement, and their elbows are only a few inches up. It's only a slide, and leather handles that just great.
The jackets below are perforated for lots of air flow, and have CE padding to help protect you in case of a crash. They are comfortable from about 70 degrees into the low to mid 90s. Some have zip-in liners that make them comfortable down to almost 60 degrees.
Body armor is apparently meant to be worn under a motocross jersey, so you can give maximum advertising exposure. Sometimes this equipment is available at large discounts at NewEnough.com or MotorcycleCloseouts.com.