I generally do a hand running running stitch along both apron top edges catching the canvas to the tartan , and a bit of padding stitching at either edge through the extra vertical folds, and then when I attach the waistband - usually by machine , that give an extra line of stitching.You wouldn't normally need or indeed want to tailor stitch on the aprons, having the hair canvas loose at the bottom edge helps to disguise it , but still gives the neccessary support, and stop the front apron from creasing too much in use.