I'm not sure why I decided to be Madeline, but that is what I am this Halloween. I, of course, didn't get working on it till the last minute, so I finished today (Halloween). It doesn't take that long to make. It takes the most time making the dress. Though you can always buy one that would work just as well. What really makes the costume is the white collar with red ribbon.
I actually checked out Madeline books to make sure I got the costume right. I had to check out three to find a picture I wanted to replicate because all of the images are painted differently.
So there are three main pieces to this costume. Some of the supplies overlap, but here is what you need.