I finished the Unmentionables in time for Alexa's 4th birthday, and she looked adorable in them. I recognize that I am a bit biased here, but look-
So I am not very good at the formal details post, but here goes
Pattern: Emma's Unmentionables by Lee Wood Juvan published in Knitty, Spring 2008
Yarn: Longmeadow by Valley yarns in lettuce, less than 4 skeins.
Size: 2 year old waist, four-year old lengths for the rest.