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As far as I know this is a physiology thing. Somehow the body cannot handle the low pressure above 25000 ft, even while having an oxygen mask on with 100% oxygen. Above 25000ft, there would be a need for pressure suits and pressure oxygen. Anyone able to confirm this for a fact?"
"Pressure suits are not needed , oxygen masks will do just fine.
Only above 60.000ft a absolute need for a constant pressure suit becomes an issue."
Wouldn't recommend going above 25,000 feet unless you have been on pure O2 for an hour to purge the body of nitrogen. If you don't, nitrogen can be released into the blood stream causing all sorts of nasty problems with your body/central nervous system.