I can tell you this: DO NOT EVEN CONSIDER WHAT THEY SELL ON E BAY! Or,anything like it! Those are made in china somewhere,and they do NOT do any proper research on the ones used on the show;From what I heard,the materieal used on the screen flight suits is scarcer than hen's teeth now; I certainly would love to have one myself,along with the helmet.
The stuff on Ali express is also made in china. The only unis that they make that are close enough to accuracy are the duty blues.