My theory behind shorts, is that if it goes so badly wrong that you crash and burn, ½mm of denim aint going to make that much difference
You could of course do a Michael Schumacher and wear a fireproof suit, a £200,000 helmet, gloves, and balaclava, but at the end of the day, you'll probably crash becasue you can't see out, let alone move around the cockpit.....
Wear whatever you want !
Cheers
EA