During the 2012 MLB season, each team in the majors will feature all sorts of different uniforms. There will be throwbacks, old minor league uniforms, Negro league uniform, and more.â†µ
Each team has their alternate uniforms scheduled and you can find out when and what type of uniform here.
As for the Arizona Diamondbacks, being that the team has bee in existence only since 1998, there is not much in the way of choices, although the 90's uniforms did have several variations.â†µ
On September 15, against the San Francisco Giants, the D-backs will sport a 90's version of their unis, although which type has not yet been revealed. There was a fan vote on the matter some time ago.â†µ
However, is there really any doubt which throwbacks will be used? It will have to be the ones they wore when the won the World Series. The ones they wore last year to celebrate 10 years since their championship.â†µ