I am assuming you are referring to what is called the peplum. Carla C has a tutorial on her blog to add the peplum to the simply sweet, and this technique can be used for any dress really. Here is a link to her tutorial for the Cinderella version of a simply sweet:
http://scientificseamstress.blogspot.com/2009/09/simply-sweet-storytime.html
On the shoulders is really just poufy sleeves as far as I know, so if you have a dress pattern with poufy sleeves that might work. Or I have seen both the portrait peasant and the simply sweet patterns by Carla C used for Cinderella type dresses that look really cute.
Hope that helps.
I just used those Carla C directions for the doll version and added it to a portrait peasant dress for a Big Give. The directions sound weird to sew a long L shaped line onto a rectangle to make the peplums but I think it came out looking pretty good.
