I am not an expert. But can you try to iron a fusible interface on the wrong side of fabric? I know rayon might melt if the iron is too hot, so you will have to test it first.
Or can you shorten you dress ? or crochet a lace on the hem of your dress. ( That is what I am going to do to my lengthen my dress. I gusee I will show you how it looks after it's done)
Sharon, January 2010