Not quite sure what you're asking, but here's one possibility:

If you are pressing an area that has multiple layers of fabric, try putting a piece of card stock/cardboard/additional folded material etc. in place to "level the playing field." For example, if there's a pleat that ends beneath your front apron, don't just press across the single apron layer and onto the doubled pleat layer -- put something beneath the single-layer fabric so that your iron is pressing across a level surface.

If you are trying to describe some other issue, I think we need more hints.