I get goose pumps in 25c water with no suit quite fast. I will also shiver unless I will relax myself consciously. I know some people can raise goose pumps on their limbs just by will.
I think that in general those are automatic responses that can be trained to overcome, as they are not very beneficial in water.
Might be a little relevant - I think I remember from some documentary about hypothermia in water that shivering and being passive with all your limbs close to your core isn't gonna keep you warm as long as if you're actively moving, I'm not sure if it's valid to all water temperatures though.
I think I also remember from the same program that in water blubber is a much more efficient insulator than fur (maybe twice as much) and cloths.
I also think I remember (maybe?) Eric Fattah wrote here that shivering metabolism is also lipolytic to some percentage.
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