Depending on the temp of the water you will be wearing it in should determine the thickness of the suit. When I was diving in cold water (45+) I would use a 1/4" 2 piece suit. Hint: I would bring a thermos of warm water with me and before entry into the cold water I would pour the warm water into the suit. Even in 85 degree water it will eventually drop your core temp down. In warm water I would use just the top primarily for protection from accidental touching of fire coral or bumping into anything. Some people would use Lycra suits which are very thin
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