ManiMina who sells her pdf patterns on Etsy for about. $5 each. This dress is called the Lili Dress. It has only two pattern pieces: the sleeve and the front/back. So simple! There are options for a belt and belt loops (first picture) and varying collar heights. I love the one below!
I made a size 4T dress and it used only one yard of fabric. The design is very simple; I was probably done in under an hour. The pattern is available in sizes 12 mos. to 4T and in pdf format. The only thing I will change next time is to add a little more roominess around the shoulders. V is quite lean, and I find the dress a fairly slim fit. To add more give in this area, simply cut the front and back bodice pattern pieces each one inch wider.
You can find this dress pattern and others at the ManiMina Etsy shop.