The invention relates to a method for use in constructing a garment (25) including elastic therein, in a processing system, as one of a series of consecutive workpieces in a continuous web, the method including, with respect to respective workpieces, the steps of: (a) stretching a continuous elastic; (b) incorporating the stretched continuous elastic into the continuous web; and (c) relieving stretch in the elastic at a first portion of each respective workpiece in the web, the relieving of stretch comprising using a dancer roll (152) to control tension in the continuous elastic as the continuous elastic is being incorporated into the continuous web, including applying a first active force to the dancer roll (152) in a first direction, and a second active force in a second opposite direction, in cycles, each cycle corresponding to the advance of one of the workpieces in the continuous web into the processing system, each cycle thus causing movement of the dancer roll (152), including (i) corresponding relieving of tension in the continuous elastic as the continuous elastic is incorporated into the web at the first portion of the corresponding workpiece, and (ii) imposing of tension as the continuous elastic is incorporated into the web at a second portion of the workpiece. Furthermore, the invention relates to a respective processing system.