I have two other rules i follow pertaining to jerseys...
1. I cannot go out and purchase a jersey within a given season. If i ever buy a new one, its during the off-season. If by chance I ever break this rule, then i will not wear the jersey during any game of that season for fear of jinxing the team whose jersey i just bought (either the steelers or penguins).
The exception to my rule is if the jersey is a gift, usually for either Christmas or my Birthday. If it's a case that someone went out and spent money on the jersey for me without my knowledge, then I'm OK to wear it for the next game.
2. Same goes for washing the jerseys.....if by some strange circumstance my jersey needs washed, then it has to wait until the off season. Both my black Polamalu and my WC crosby jersey have not been washed since wearing them to the SB and game 1 of the finals last year respectively.