I say make it yourself. Follow the Xkilt instructions available here on xmarks. Choose a poly/cotton blend so wrinkling is not an issue. Sew down those pleats for durability and tailor the kilt to fit your body. I know the quality with some companies is an issue, yet when one makes it from scratch there is no mistake about material nor workmanship. But hey, that's just me.

As to the item to be unmentioned, would a belly band or molded pancake provide access while discretely maintaining smooth lines ? I've no first hand experience in this latter department.