I've seen a few people talk about using water balloons, but no discussion (that I found) about having a zentai suit/similar deal (a wetsuit maybe?) filled with water while being worn. I'd think it would be a pretty cool thing, as the person inside might be able to actually feel changes in pressure (i.e. someone pressing on the suit), which one really cant with air.
the fear would be that, if it popped, it would be a huge mess, even if the person was outdoors.
anyone done anything like this?
This has been discussed before. Water is very heavy. If we assume a sphere 5 feet in diameter—not that a Zentai suit would get that big, but just to give you an example—the volume would weigh nearly two tons. Go Google big fish tanks. (You don't want one on the second floor of a wood frame house without special reinforcements.)