Your Wetsuit Should Feel Snug But Not Tight

How can you tell if a wetsuit fits properly? First, it needs to feel snug but comfortable. An overly tight suit can hurt your circulation and impede your breathing. It won't keep you any warmer either.
Make sure the neck and chest don't feel too tight. Your suit should be form fitting, meaning there should be no loose folds.
Check out how the suit feels in the water. Once the suit fills, feel how the water heats and then warms your body. Try swimming around in the suit, to ensure that it does not allow too much water in, which will have the reverse effect and make you feel cold.