We found it!

Today I looked at 1,000s of girls dresses. I tried all sorts of things to find something that would work. I started envisioning different sashes and planning a trip to the fabric store, and this evening just before shutting down the computer to cook dinner-- I found it!

The funny part is that my sister saw the same dress earlier today, but thought it wouldn't work so didn't mention it to me.

Here it is!