I remember reading about this record as a schoolboy. One day a classmate was bragging that he had been in an aircraft when the captain had announced that they were now flying at a height of one million feet! My protestations that this was more than ten times the world altitude record were ignored, the rest of the class preferring his version as being more exciting than the boring truth!
Several reference to Canberra high altitude flights, with reference to the pressure suits worn, on this old U2 thread
http://www.pprune.org/military-aviat...-pilots-2.html
Go to post #37 and after.