The invention relates to a method for use in constructing a garment (25) including elastic, in a processing system, as one of a series of consecutive workpieces in a continuous web, each respective workpiece having front and back body portions, separated by a crotch portion, the method including, with respect to respective workpieces, the steps of: (a) stretching first and second leg elastics (b) incorporating the first and second stretched leg elastics into the continuous web in stretched condition and (c) stretching third leg elastic, orienting the third leg elastic in a direction transverse to the longitudinal dimension of the web, and, while maintaining the stretched third leg elastic in the transverse orientation, incorporating the stretched third leg elastic along opposing edges of the crotch portion such that opposing portions of the third leg elastic are disposed on opposing sides of the crotch adjacent respective ones of the first and second leg elastics, to thereby provide effective continuity of stretching capacity at the respective leg openings between the third leg elastic and respective ones of the first and second leg elastics. Furthermore, the invention relates to a respective processing system.