What he meant was he calculated 34000ft/min descent rate.
Have you ever seen a VSI with a scale greater than 6000?
Anyway, 4Grenn's question was about pressure suits, not pressure breathing apparatus, which every aircraft has.
Don't know exactly at what altitude pressure suits become necessary in order to avoid bubbles, but the short answer is that pressure suits are not required on the Concorde (they would be required for the passengers too...) because the certification requirements take into account the loss of one small window, an immediate descent at an amazing rate and oxygen masks for breathing.
No pressure suits needed (that would be unthinkable on an airliner)