While playing with my two year old son, who was wearing footed pajamas, I had a thought concerning the STTMP uniforms.
Since the uniforms are more or less one piece maybe they could be used as emergency pressure suits with the addition of gloves and a helmet.
The corridors do have life support equipment in the wall lockers according to Mr Scott's Guide to the Enterprise
. I do not think it is much of a stretch to imagine helmet/glove lockers in other locations.