A nice site with lots of lovely FREE patterns - Maybe one day I'll attempt something like this XD
Fashion Templates for Measure: DRESS TO MAKE EASY - 20
20+ Free Sewing Patterns w/Instructions - Above Peppermint Magazine's Newest Pattern Download, The Reversible Dress, Fully Lined For 2 Dresses In One
Sisterhood of the Crafty Pants: DIY Dress Pattern: Using Shapes
simple dress, I'd make it a tad longer in length and maybe deepen the neckline just a tiny bit.