Seriously , I don't think it will make any difference at all. It will be interesting for a couple games to see when the team runs out on the field. And recruits won't groan like they did with Russell. That's about it. I never heard specifics on the fit of the Russell uniforms before this . It was about the looks, or so I thought. But stretchier material won't translate to more yardage or wins definitively , unless the players specifically point it out, which I highly doubt.
Imagine the quote from KB : " Yeah man , the Clemson dude was coming up to tackle me , but 'cause I had on these stretchier pants , I put a move on him , and went to the house".