Hello, this is a 4 button pattern from 1900, it has a rather pronounced “A” shaped gap at the front. When closed it has ½” too much overlap at the top button and 1/2" too little at the bottom. Is this a “cruckening” at the front neck point of the shoulder to fix? [if so how much?]
Or do the sides need letting out at the seat. Or both, is it is a little tight on the seat?

UPDATE - this turned out to be a drafting error. I copped a pattern and pin wheeled the constriction line and not the lapel line... DOH
I haven't read all the comments.
Just back from a months long vacation.
Its too long in the front balance.
Take 1/2" off all the way through the front shoulder and do a re-baste.
You wrote, it seems a bit tight at the back, so I'd say: drop the front shoulder points 1/2", so the A gap will close.
While you're at it, it seems you have a dropped right shoulder, so you might take it up a bit ( 1/4") at the neck point too.