The neckline flounce is a style that allows you to stretch and wear the neckline off the shoulder through the use of an elastic casing. This one can be a bit tricky so you'll want to watch this demonstration to see how it's done.
Flounce Neckline
Tag: stay stitch
Stay Stitch
Stay Stitching helps keep curved edges from distorting and stretching. Watch this tutorial to learn how to create this stitch.