A regular bind off should work well but it needs to be done loosely. If you have to, go up a needle size or two. When you cast on, you just do a regular cast on and the pattern pulls the fabric into scallops. You may get inverted scallops for the cast off but it should still wave. This video
shows you what that looks like and recommends a bind off on row 2 of their pattern for the neatest effect.