If you have a creative touch, here are some cheap dresses. They're not quite floor length, but if you are planning to sew or add on to an existing dress, they'd make a nice base. Also, if you don't mind waiting a month on delivery. haha
https://bloomchic.com/collections/party-3/products/ombre-glitter-mesh-cami-midi-dress
https://bloomchic.com/c...... reply
