You just sew the size fabric you need in a tube with the ribbons in the seam on the top. They sew about an inch down when it is right side out for the elastic to run through. I added the band of a second fabric on the bottom for fun and the flowers as accessories.
I made this dress for my little niece and I love how it turned out. The fabric was chosen by my SIL for her nursery, but then she went a different direction, so I told her I'd find something to do with it.
With the bit of fabric that was left and finding some cute ribbon scraps in my stash I made a little taggie for her since all babies love tags. I think it turned out so cute and made me want to make one for my little girl, even though she is way passed this stage!