I used a size 80 bodice but added length since my niece is a skinny little thing. The bodice looks right size for her, but the width on the skirt is overkill!! I know it's twirly but wow! It's a full circle skirt. It's a gift so it hasn't been tried on yet.

Since I had to lengthen I added about 3/4 of an inch to each tier and then added a full tier at the bottom instead of the short ruffle.