Abstract: A ruffling slide for making articles with stretchable portions includes a tubular sleeve for containing at least one resiliently elastic yarn element connecting the portions transversely provided on the sleeve and space apart in such a way that they define tubular ruffling sections. The connecting portions also form narrowed portions for locally clamping the elastic yarn elements. The yarn element inserts into the sleeve and is clamped at the narrowed portions in such a way that it extends freely through each tubular section and is movable therein between two positions, i.e., an inoperative position and an operative position in which said element is shorter than the section in question, whereby it may subsequently impart a ruffle thereto in a direction substantially perpendicular to the general direction of the sleeve.