I make the dresses for Little Dresses For Africa & if you go to their website you can get the pattern and I think there is a link to go to Nancy Zieman's site. Her instructions have how to use yardage for the dresses. I have lots of fun with them & add lace, pockets, etc.
Made my granddaughters some but for the ties made a sash that threaded through and they were beautiful- found that on Pinterest