Aren't those suits supposed to protect one should they get blown overboard? they blow up like a life preserver or something?
That's one function, IIRC. However, not being a skimmer puke, I'm not as familiar with them as someone like, say, Thor. However, towards the end of my tenure on the boats we were given something similar. Not as bulky as a kapok vest, but if you fell over and a sensor of sorts got wet, the CO2 cartridges would discharge and inflate the pockets.