I was just thinking about this... whilst watching Star Wars... generally speaking most mandos are pretty decent pilots... they just don't do it as their primary specialty. As I understand it... standard armor will protect you from vacuum for about the same time that the Pilot's uniforms for TIE or Reb Pilots would. Remember that the armor is not just the plates, but the whole kit and kaboodle... the suit is generally (in the SW universe) made from a energy absorbing material that would act as blaster resistant soft armor... and can seal itself against vacuum, time dependent on the rest of the kit. Add to that the vest which also acts as even better soft armor against blast/frag and sometimes even lightsabers (depending on what's weaved into it). Over that is the plates, which provides the majority of the projectile, blast, frag, energy protection to the wearer... but does not affect the seal. Pilots may not need as much armor, but more vacseal... just a thought.