My dress is a variation on my picnic dress (tutorial here), in solid cotton with a decorative waistband and ties. Since the fabric is only patterned on one side I made the ties a bit differently. I cut four pieces instead of two, paired them with the right sides facing in, sewed along both long sides and one short, turned them right side out, and sewed the unfinished end into the side seam. You might want to top stitch along the edges, although I just ironed them flat.
Isabel’s skirt and shoes are thrifted, my shoes are from this lovely Etsy store, and I made Isabel’s hair clip by sticking a bunch of feathers to black electrical tape and gluing that to a clip. Very fancy.