When riding two wheels, I always wear my First Gear leather jacket. I buy such things from Leather Up..
Here
On the rig, with much slower speeds and safer stance, I wear either the leather, when cold, or a Joe Rocket Lightning jacket, with armor.
I always ride with a helmet - here in Washington, it is required - in Indiana is wasn't and I still rode with one.
Leather Up also has good leather pants.. great for keeping wind of you and stops most road rash immediately.
There are a lot of different jackets around - if you only have one, make it a leather one..