Slam
I had to wear the entire rig, Suit, boots, Lifejacket,G-Pants Helmet, mask , gloves at the Koln Messe to demonstrate a flight sim some years ago.
Chuck Yeagers air combat I think it was. Entire rig came from Flying Equipment stores at RAF Gutersloh as then was. No problems with the visors, had the mask and hose on as well, Enough oxygen getting through the hose, but wouldn't like to be wearing it for any legth of time without a pressure feed. Mind you, when it got intense, you sweat, and the temperature in the messe didn't help much either.
Did a similar thing at the first Schonefeld airshow, that was a bit more difficult, as I had got outside an entire yellow handbag the night before, and felt very pukey and alles uber der platz
Ahhhhhhh Die Koenig unter den bieren
Errrrrrr hope that helps.....