Not to put too fine a point on it, but it seems like there's a conflict when
wearing a two-piece (pants + shirt) outfit under a bag suit that has a relief
zipper.

No belt on the pants and they tend to fall down inside the suit.

Belt or cinch strap on the pants, and now the relief zipper isn't good for
anything.

Anybody found a solution?

Suspenders?
--
PeteCresswell