I didn't have to make any alterations to this dress. Depending on what type of material you use you may want to include a lining (mine went to the knees).
I created the first few with a knit based top section similar to the pattern picture and a light weight cotton bottom section. To make a dress a bit more elegant I ended up using the top and bottom in the same cotton/polyester material even though it wasn't stretch material and it still worked fine.
Short Dress Version