Back in the days before the neoprene type drysuit you get today, a drysuit was a rubberbag with arms and legs, and sealed around your waist by folding the jacket to the pants, or twisting the excess rubber from the hole you climbed into and putting a clamp on it..Your warmth came entirely from your insulated underware.. (the pre-curser to todays woolly bears) When the first wetsuit came out in the fifties, there was no nylon linings, and you had to cover yourself with talc to get into it. Rips, and tears were common, as was 'wet suit glue', basically just contact rubber cement.. I have spent well over a hour surface supplied, under 3 feet of ice in a 1/4" suit, and was 'almost' comfortable.. If a suit fits, your warm, if not. your cold. If water 'moves' in your suit, it does not fit. there should be a little slack under the arms, in the crotch (thank god), and behind the knees. water should 'seep' into these areas by slowly squeezing past your skin, as your body heat warms it up.. The suit should be skin tight.. I have wet suit boots, that have tough rubber soles, and will stand up to virtually any rocky beach.. If you shop around, and ask questions you can find exactly what you need.. One of the side benefits of a wetsuit, is you float like a cork in one. If the current catches you, its unlikely (without weights) you will be sucked under. I personally used about 18lbs of lead in fresh water to be nutrally buoyant, so thats 18lbs of positive buoyancy.. If you like to duck dive down, and you don't have weights on, yer gonna have a tough time!