I recently had a dinner jacket and trousers made in midnight blue Loro Piana fabric. Unfortunately, since I was in a hurry, I did not have time to have a cummerbund or a bowtie made. Anyway, I pinged the tailor to make me a cummerbund and a bowtie in the same fabric, but he replied back stating that I should make it "...in satin silk rather than the suit fabric as that is the norm". However, I do not have gross grain lapels -- only plain ones. I almost feel that the cummerbund must match the lapel fabric (since my lapels are plain, my cummerbund also ought to be so). Thoughts? Would a satin cummerbund look out of place, or is there something I can do that would be adventurous yet conservative?