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The stitch is called Angel's Wings, on page 74 of Linda Corirossi's "Canvas Embellishment: Exquisite Needlepoint Stitches Made Simple" book. (Note: this is her first book, not "Canvas Embellishment: The Sequel.")
http://www.threadneedlestreet.com/booksndptstitches.htm
I think this looks quite nice as it echoes the zig-zag pattern of her skirt, but runs diagonally NE to SW which is the way the wings are laid out. It also looks like the fancy sleeve of her gown, which is a plus since it ties the outfit together visually. As an added bonus, I've not used this stitch before--something new is always fun to try.
As you can see, I have a lot of background to go and haven't started the rat's face and paw or the collar, either. But I'm getting there!
Jane/Chilly Hollow
Main blog at http://blog.360.yahoo.com/chillyhollow