One other consideration: orange give away t-shirts.
I know they're probably more expensive. However, a lot of teams are establishing a single color for all fans to wear during important games (ie playoffs). We're in a unique position to establish orange as our color.
Wearing orange could help create solidarity and unity amongst fans, plus add to the experience of attending a game. It's the kind of little tradition that helps people with marginal interest in the game normally (house wives, children, etc.) get more into the game.