The "hipster" can be seen most often in the Mission District of San Francisco.
The hipster is categorized by it's fixie bike, messenger bag, too-tight jeans, vintage tee collection, headband over unkempt hair, too-large glasses and/or sunglasses, and PBR.
Some male hipsters find it necessary to have large mustaches on the facial area, while others charge full-force with a beard.
Hipsters have an obsession with all things "vintage," such as vinyl records. Most hipsters can be seen in vintage shirts with out-of-style print for the purpose of ironic humor. Handmade and off-center screen-prints are popular. Bonus points if it looks worn, or faded.
Note: Hipster clothing can generally be unisex, with the exception of the skirts and dresses some hipster-girls wear.
See, the Hipster Olympics: http://www.youtube.com/watch?v=kAO4EVMlpwM