just a tip..don't use a straight stitch on lastin or other such elastics as the elastic will shred away. Think of those coupons (and bills...yuck!) that you get with the perforated dotted lines that you tear away...the same thing will happen with rubber elastic if you use a straight stitch it willl create those perforations that will cause the elastic to tear away...oopsie!!. Straight stitching is not so bad on braided elastics because of the way they are made up of many different fibres. but if you are using elastic on a a stretch fabric so not really nappies but if you are doing some other project always use a zig zag or stretch stitch...using a straight stitch will cause the threads to snap when the garment is stretched out and that could be really funny when the waist falls down!!