I have a suspicion that the gold shirts on Star Trek were made of inferior quality by the 23rd century equivalent of Chinese factory workers. Because, Spock never tears his science blue shirt, ever. I'm sure of this. In fact, I can't think of any other character who has his shirt torn. Even the redshirts don't tear their shirts. It's just Kirk's gold ones. That's probably why he started wearing the green ones; he literally ran out of gold shirts. I bet Kirk kept meaning to send a complaint to Starfleet, but he kept getting distracted by his perfectly shaved chest until he forgot what he was going to complain about.