A garment construction for making underwater garments that may be made in several different sizes using many of the same or substantially identical panels and other key panels of varying dimension and which are cut to fit the garment to a particular individual. In an underwater garment construction having a lower portion comprising a pair of thigh-hip panels extending from the waist to the knee, a pair of leg panels extending from the knee to the ankle, one knee panel being connected to one thigh-hip panel, and a pair of key panels extending from the waist to the ankle, each key panel being connected to one pair of thigh-hip and leg panels, the width of said key panel being precisely cut to provide exact size and fit for a particular individual. An underwater garment comprising trousers, a chest panel extending around the chest of the wearer and connecting to a back panel, said back panel being cut to a particular width to fit a particular individual, and a waist panel connected end-to-end and joined to said trousers, chest and back panels, the length and width of said waist panel being cut to fit the height and girth of a particular individual.