If I have no luck adjusting this, I'm perfectly happy to wear it as a 4x1 - but I question my own ability to pull such a brave look off.
Edited by PrestonCR - 8/12/16 at 12:46pm
I would first ask how much you value that suit - reshaping the lapels is a risky proposition. Once you apply the heat of the iron you risk warping the canvas underneath; if the chest is fused applying heat can cause the fusing to "bubble".
That lapel seems pretty hard pressed to me, and I think even if you were able to get the crease out of the lower portion successfully, it would pull weirdly across the front given how far the second button is up and across the chest.
How does the 4x1 look as is? Can you rock it? Or do you feel uncomfortable wearing it and is it very obviously dated?
What you are attempting is the opposite of rolling the lapel from the top button of a 3 button to the lower middle button.
You are asking to make the lapel roll higher. You cannot do this by pressing. This is a function of the tension of the collar on the lapel. To create the lapel roll to a higher point you need a new collar that is longer. This is possible if the collar has outlets folded under at both ends of the collar. You only need to remake the under collar and apply the top collar. You will want to adjust the front edge on the left front to remove the curve on the lapel edge from the lowest button to the new buttonhole position. If you don't change the length of the collar and just add a new buttonhole, the lapel will still roll to the lower point and will look strained when buttoning the jacket higher. Will pull away at the collar.
What did you mean when you said it is easy to move buttonholes?