Nomex suits can get toasty. I've worn them. And in the pits there isn't a whole lot of breeze you know. Oh yeah you can get the dizzies.
But myself, and my fellow motorcycle racers past and present, will all attest that a nomex suit feels like fishnet once you've experienced a full roadracing leather suit, helmet. boots and gloves.
I think you could wrap yourself in foil and sunbath in a microwave and it would still be cooler.
One track I raced at was especially brutal. Colombia, SC...which labels itself as "famously hot!"..it was 105 degrees all the time and track temperatures usually between 125 and 130. Now get on the track in those leathers atop of a cooking engine and two wheels and go as fast as you possibly can at every part of the track.
For 20 laps.
We knew the deal. Hot as living hell. Drank water like a fish all day and still weigh 6 lbs less when you got home.
We do it because we're racers, and when you fall down..and you do..you get to keep your skin.
Here's a secret; to be honest, motorcycle racers can't really relate to car racers complaining about anything...