I'd like to know how fire retardent gloves boots underpants googles and whatever else you wear is going to help you at any altitude if your aircraft is on fire. Short of exceeding Vne and ripping the wings off to get the aircraft on the ground-its still going to take a while to get that aircraft on the ground. if theres fire, the clothes will only take so much before they no longer serve their purpose (at which time you are still gliding down)
If you are wearing it on the assumption that if there was a problem, and you crashed during an ensuing forced landing which resulted in a fire - chances are you would be out of that aircraft in a flash(pardon the pun) or if you crashed landed and the aircraft caught fire and you were jammed in - no one is going to be around to get you out for a while. Your fire retardent clothes will only delay the burns.
Some on this thread have mentioned wearing gloves when flying their light aircraft for better adhession...if you sweat that much you shouldn't be flying!!! If your having to 'hang' onto the controls, you shouldn't be flying! or perhapes, because you are wearing all this fire retardent stuff - your swealtering??
As to PPL stripes - grippers
We have quite a few flying establishments over here which provide full time courses. What you do see is the name of the establishment on the shoulders - no stripes unless you are an instructor.