If you've been riding for years and using the same jacket all that time, you've created a piece of clothing with a history. Everywhere you've ridden on your bike, your jacket has been with you. Bikers have an opportunity to turn their riding jacket into a visual history of wherever they've been by adding biker patches to it from each stop. It can be a really cool and fun way of seeing where you've been and letting other people know how many different rallies or locations you've ridden to.
One thing some people like to do is collect a small souvenir from each state they visit. Motorcycle riders could add a state rocker patch to their jacket for each state they ride through. While these rockers are designed to go on the sleeve of your jacket, you can put them on the back or front, too. Other riders pick up a new motorcycle patch each time they go to one of the major rallies. You mike see something like a Laconia 2012 patch on their jackets. You can see everywhere you've been with jackets like these.
If you want to create map of where you've been but don't want to use such obvious patches, you can always simply buy a cool patch during each major ride of rally you attend. These patches will chart your history, but their meaning will only be clear to you. Others won't be able to look at your jacket and know where you've been, but instead they'll see a really cool collection of patches.
Instead of buying a lot of motorcycle patches right off, you can create a jacket that follows your riding career. It's a lot of fun and makes your jacket a piece of your history.