Pebble's Halloween Costume

My dad is a big fan of my kids and thought that my youngest should be Pebbles for Halloween. Her hair is usually up in a firework ponytail, so much of the time, she looks like Pebbles! I am a sewing novice. I have done blankets and can hem and such, but have never attempted anything from a strip of fabric. I measured using a dress that fit her and after some adjustments, got the dress over her head (just barely!) Probably should have used elastic? I also attempted to make a diaper cover without much luck. She has some seriously chubby legs! So, her diaper cover became a cute hat. I was so proud of me and she was a doll!!