They're most definitely custom. If you're looking for a good base shirt, you can use one of the jersey-knit "athletic/preppy/vintage" fit light blue polos you can find at Target. That's what I used for mine:
[image]http://home.austin.rr.com/ethanwil/kingsley.jpg[/image]
Modified it into a button down shirt. The blue material is a sueded synthetic (not sure the right name for it) which seemed to be a good match to the movie. Doing all the work to make it button-down instead of polo probably isn't necessary; you can just stitch the stripe onto the front and add dummy buttons.
The movie track pants were custom made as well I believe. I wasn't able to find any track pants in the right color, so i just went with some slacks I found on clearance at Dillards Fairly close color match, but not 100%.
Ethan