I did a 1500 nautical mile trip with one other guy, offshore up the West coast. We never had to be rescued or even don our suits except for a drill,

but we wore orange or green the whole time (even our shore crew got a shirt).

You fall overboard in cold water, you want to be spotted quickly ...

My mechanic suit wasn't orange though it was reflective. It was primarily to keep me from getting burned in the engine room.