It ended up being about a 2T size, so for the REAL skirt I'll do larger dimensions. But truly, for a mock-up, this skirt rocks.
It still fit, but it was tight. And short.
And the tulle underskirt wasn't full enough. But that darling fabric rosette? LOVE.I only put elastic on the back of the waistband. It looks really nice this way. I can't wait to perfect the pattern, and share the How-To with the rest of Blogland!