Hello everyone, I've made a few of these myself and think they turned out nice.
Cupcake Dress with matching bow or streamer by pigtailsandponytails on Etsy
i make my own pattern.if anyone is interested please let me know ill share my tricks.
Ive searched and searched for a pattern till i gave up and did it myself. however today i came across these sites and wanted to share.
Children's Boutique Sewing Patterns: Pillowcase Dress Patterns
Pillowcase Dress Instructions ? Red Instead BLOG
Pillow Case Dress Pattern - Pillowcase Dress Patterns for Girls - Sewing Pattern for Pillowcase Dress
I also love Burda Style if you haven't heard of it check it out.
Sewing Patterns, Tutorials, Skills, Projects ? For People Who Sew | BurdaStyle.com
Hope any of this was some help!