Hi guys. I'm not planning to DIY this but since a lot of you are craftsmen and craftswomen in this section I need a little advice from people who know their stuff. Any help would be appreciated.

I'm looking at clearance kilt jackets that are pure wool... I'm saving £180 buying the clearance to buying one in the regular section.
I'm a 40L generally... they have a 36L, 42S and 44L.

I'm looking to buy one and have it altered. The 42S would need to come down around an inch in the sleeve, but I'm guessing it would be the easiest to alter to my size, right?
The 44L sleeve length is great, but I'd have to get 4 inches taken from the chest and a bit off the shoulders.
The 36L couldnt poissibly give another 4 inches in the chest, could it?

...
Basically I'm wondering what size would be best to have altered to my size convincingly. Any ideas?
Also - how much do you think this alteration would cost me to have it done professionally?

Thanks,
Paul