A comfortable mask skirt allows a close fit and a good seal . Test the fit by placing the mask against your face and inhaling through your nose . The mask should be pulled onto your face by suction and stay there while you are inhaling. A silicon , rather than neoprene, skirt is softer, longer-lasting, more attractive and less irritable to the skin. Adjustable fins are worn with wet-suit boots.
Some covering is desirable simply to protect against abrasion, sunburn and for warmth in the water .
In the tropics, thin material like Lycra is sufficient. Full body wetsuits work fine but are not necessary. More useful separates such as Lycra-based bicycling or other sports pants and shirts work fine.