When a “bird’s nest” of thread appears … the likely culprit is your upper thread tension. If loops appear on the underside of the fabric, the upper thread tension may be too loose. If knots appear on top of the fabric, the upper tension may be too tight.
The sash pulls into a big bow at the back. Might have to do something about that big bow, but ADORABLE dress that would most def be too short for me if I bought it in a store! One day when I learn to sew, I WILL make this dress.