This Belle from Beauty and the Beast Costume is such a simple and inexpensive idea for a fancy dress costume idea. You just need a blue dress and fabric to make some of the accessories. This project is perfect for a beginner sewer as it’s not too tricky. Follow the link for the tutorial; http://www.sheknows.com/beauty-and-style/articles/1053031/3-easy-diy-disney-princess-costumes/page:3
If you would like to learn or brush up on other basic sewing techniques before you start this project go here; Sewing Techniques & Stitches to find the skill you would like to work on.
If you would like to see more easy/ beginner sewing projects go here; Easy/Beginner Projects
If you would like to see challenging/Experienced projects sewing go here; Challenging/Experienced Projects