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A full is a one-piece suit. Trousers and a shirt will give you more variety in mixing and matching undersuits. Socks will give extra warmth to your feet.
With a trilaminate drysuit, typically an undersuit of 200 grams or thicker is used. When wearing a neoprene drysuit, undersuits up to 200 grams are recommended, depending on the tickness of the neoprene.