This is the first pattern I have made where it calls for a back stay. As you can see on the illustration, the top is blousy, with a wide neckline and the back is very gathered. The back stay stabilizes the back and makes it fit close to the body. This holds the top in place, making it appear loose, while it is really very stable. In all, it makes it so that you aren't spending the whole day tugging your dress into the right shape!
Wiat til you see this dress! I am very proud of my work!