to advance from the first sewing station 40 through the folding station 42 and then through the second sewing station 43 the head and foot edge portions 26 and 27 of each are folded at the folding station 42 into overlying relationship so as to form the head and foot skirts 14 and 15 which overlie the next adjacent edge portions 44 and 45 of the main body portion 11 the main body portion 11 as well as the head and foot edge portions 26 and 27 move through a 90 degree angle from a horizontal direction of movement to a vertical direction of movement as indicated by arrow 48 the main body portion 11 then moves through a 180 degree turn as indicated by arrows 49 so as to begin a downward movement in the meantime as the central body portion 11 approaches its u turn the head and foot edge portions 26 and 27 each progress through a 90 degree turn 50 and 51 so as to be turned laterally inwardly toward the main body portion 11 as the main body portion moves downwardly away from the u turn the head and foot edge portions each turn through a second 90 degree turn 53 and 54 so as to begin a downward movement with the main body portion 11 this causes the head and foot edge portions 26 and 27 to become folded in overlying relationship with respect to the main body portion 11 thereby forming the head and foot skirts 14 and 15 after the head and foot skirts 14 and 15 have been formed the main body portion.