I’m sure there are lots of patterns for such a thing as a girl’s sundress with a knitted top and a fabric skirt.
Any pattern suggestions to fit a 4yr old?
Not everyone is on Ravelry, but if you are there is one at the link Carey posted.
Here are some off site links.
http://www.knotions.com/issues/summer_2009/patterns/sunny_sunny_sunny/directions.aspx
Not free, but cute and looks easy.
http://www.knitty.com/ISSUEsummer09/PATTelenka.php
I know you didn’t want a knitted skirt, but you can always knit the top and add a gathered fabric skirt.