I couldn't sleep last night. I was up from 1am to 5am. Middle age, worrying too much, whatever... Luckily it's Sunday, and I could sleep in. I did get a lovely uninterrupted sewing block out of the deal.
I started with a plain cotton t shirt, cut it off under the arms and added a gathered skirt and a ruffle. My favorite tip for making gathers and ruffles is to increase the tension on your machine when you baste the fabric. If you do it right, the machine does all of the work for you - no pulling threads!
This beautiful fabric is from Good Folks from Anna Maria Horner. Could this line be discontinued? I can't find it in my usual online sources. I used the width of the fabric for the skirt, about 1 1/2 times the width of the t shirt; and I doubled that for the ruffle.

I added a fabric-covered button pony-tail holder.
Even though it's a departure from her usual pink, she likes it, and I have a feeling that it will be worn since it's comfortable and easy to get on.
The remainder to the t-shirt got cut into round 3" strips for hairbands.
No hemming!