Well I have been studying the film over and over trying to see every detail of the suit. I realized the screen shot I posted is actually the outer seam of his pants and not his inseam. However there is a pic posted in the gallery section (
http://thepropden.aokforums.com/esb-darth-vader-screen-caps-and-production-pictures-vt143.html) that shows that the inseam is cloth as well.
Gonk27, thanks for sharing that pic! That is very useful info to know!
As to the chest part of the suit it is hard to pick out details about it based on the film alone. The only real scenes that lets us see more of it is during the fight scenes on Bespin, which I assume to be the stunt suit. From what I could see it appeared that the chest piece didn’t have the same cloth seam as the pants and it appeared that the arms were separate, making it a three-piece suit. However I could be completely wrong about this.
Does anyone know for sure if the Hero suit was 2 or 3 pieces?
And NoHumorMan, thanks for the advice! I’ll be sure to do that if anyone gives me trouble.