Making elastic in casing

Let's make a brush that looks like elastic encasing, so we can change the…waistline of this skirt.…We're going to start with a line segment that is 30 points long, with a…0 degree Angle, and we'll zoom in.…We want to make sure that this particular line segment has Butt Caps, no fill,…and a 1 point line weight.…We're going to put effect on it.…Up to Effect > Distort & Transform > Roughen.…The settings we want to use are 2% for the Size, and it should be set to Relative.…

Let's turn on Preview, and for the Detail, we're going to kick it up to about 98,…and it should be set on Smooth.…That gives us this little gathered line segment that's going to make up the…casing for our elastic.…Now that we've got the Roughen effect applied, we need to expand this.…So, we're going to go up to Object > Expand Appearance, and now it's just a path…with a whole bunch of little points instead of an effect.…We need to select the two end points, so one in this end, hold the Shift key, and…select one on the other end using the white arrow.…