I Am Cute Dresses : 25 Simple Designs to Sew by Sato Watanabe provides simple dress patterns that you can make following the diagrams and instructions. This is originally a Japanese book, now translated into English.
The designs are loose fitting and meant to be one size fits most (although I suspect that means most people in Japan). I've made one dress from this book which I'll be showing you later this week. Some, not all (as the Amazon description implies), of the patterns give some guidance for altering the size of the pattern. Depending on your body type and the cut of the design, you will need to make adjustments to the patterns in order to achieve proper fitting.
This is one of my favorite designs from the book. It calls for using kimono fabric pieced together, making a center seam and then cut.