This is a really cute basic baby bloomer pattern. The back top curves a bit, so you have to be careful when sewing the casing for the elastic: I had to take it out and start again. But so long as you're careful sewing that part, they sew up very easily.

Shown with the Phoebis dress:

Phoebis dress and Delia bloomers by giftsandoccupations, on Flickr

In pink and in plaid:

Delia Bloomers by giftsandoccupations, on Flickr