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: elastic casing
Puff Sleeve with Elastic Hemline
Want a sleeve befitting a princess? This tutorial will take you through the steps of creating a puff sleeve with a stretchy hemline due to having elastic inserting into a casing.