Someone created a very realistic replica of Clint Bowyer's rusted helmet from this year, and Jeremy Mayfield's firesuit from 1999. My avatar is currently rocking them in races until I can get a handle on the livery editor.
The attention to detail in GT games is what really won me over and convinced me to get GT Sport. If they can figure out a way to license even a basic NASCAR model, they're really going to open pandora's box with these custom liveries. I've already seen some on Mustangs that look near perfect to their real life counterparts.