Originally Posted by
CrankyOne
Not necessarily. If you want to look like a faux racer then yes, but otherwise the normal clothes that OP already has can very likely suffice just fine. I don't wear special clothes for walking or driving somewhere nor is there a need to do so for riding a bicycle. People in the US try to make bicycling way too complicated.
Depends on the riding. i wouldn't jog or play sports in jeans or dress slacks, but maybe you would.