I have a new tuxedo (slimmer fit jacket with flat front pants) and the pants have the satin braid down the legs but not a satin waistband. The shirt style is spread collar with pleated front, the black bow tie is tie-it-yourself, and the button-tab braces are black. I have two pairs of shoes: one is patent leather slip-on, and the other is black velvet formal slippers. My question is, do I really need to wear a cummerbund? I don't want to wear a wasitcoat but do I really need to wear a cummerbund? All advice and opinions are appreciated. Thank you.