It pays to involve them in decision-making -- Miss Thing chose the fabric and the pattern and specified the changes. And she has not taken it off since I finished it two days ago. The proportions are a bit off but K. is happy that there are more princesses than pink.
The pattern is the Class Picnic Blouse, lengthened with a ruffle on the bottom and some green ric-rac at the yoke. The fabric is Happy Ever After ordered from Hawthorne Threads.
I didn't keep the receipt for the fabric and I can't remember the cost but here's the breakdown of what I used:
Fabric: 18 inches princesses in pink, 30 inches pink gingham -- approx. $15
Pattern: used before $0
Trim: the package costs $0.25 for 3 yards from Dressew so pretty much nothing
Total: about $15