To some, wearing a patched leather vest may appear that you are trying to look like or immitate a motorcycle club or biker and you may get some smirks, however if you follow a few simple guidelines of respect for actual motorcycle club patches you should be okay.
Typically motorcycle clubs have a very specific layout for their back patch consisting of the club logo in the center, a top rocker with the club name and a bottom rocker with the club or chapter location (other patches on the back of the vest may include a "M/C" and/or "1%" patch). You definately want to stay away from this layout or anything close to it. I would also recommend that you do not use a design or color scheme that is similar to that of any motorcycle club in your area or any well known national club.
Yeah, What he said!
Rex and Lucky gave the correct advise as they alway do.