A signature shirt or sig shirt or SS is a shirt that a person in a picture wears usually on purpose. This is sometimes a person's ow custom shirt but mostly it's not. These are usually validated by a myspace whore or a just a man/woman looking for a hot date. sometimes it cld be just a bikini top (hopefully only for a girl)
(Signature Shirt)
by Hellhound9210 June 23, 2009