Xbox.ign.com have posted a Q&A with Dave Perkinson, the producer of World Series Baseball. Here is some of it:

IGN: So we saw you're going to have the throwback uniforms like the Houston Astros' clown suits from the 1980s. How'd you pick which era to choose for the unis?

Dave Perkinson: It was just a matter of find the most obnoxious loud, misconceived uniforms in the history of the sport and get 'em in the game because they're the most fun. We've got the Houston Astros sort of Jell-O uniforms with all of the red, orange and blue stripes on 'em. We've got the Oakland A's with that horrible yellow jersey. We've got Philadelphia's red on red and just anything that's a true abomination of fashion, we tried to get. In the game they look abominable and fantastic

IGN: How many throwback uniforms are there exactly?

DP: There's one for each team and we just picked the year that they were the most hideous. There's this great book, Baseball Uniforms of the 20th Century, that's out of print now and we tried to scare up a copy. Somebody, somewhere in the last ten years or so decided it would be fun to sit down and make a list of every uniform ever worn by any team. So it really gave us a good chance to go through and sort of handpick what we wanted to use. Then we had really talented artists who could look at the image and duplicate the style. In a lot of cases logos have changed and it's really hard to track down old logos so we had to re-create some of them by hand.

You can read the rest of the interview here.