i_<3_chanel ....if the jacket is lined, it definitely would not be a good idea to just pull it in, you'd have to take it apart and re-do it. But if you don't have any experience in patternmaking & sewing, it could end up a disaster.
If it's not lined, you could try taking it in on the side seams through to the sleeves...and if there's any panels, you should take it in from there too....it depends on the type of jacket also,,,,im picturing a tailored jacket....so it would be harder to alter....
Otherwise,,,,your best option would be to take it to a dressmaker to alter it for you....
If it's not lined, you could try taking it in on the side seams through to the sleeves...and if there's any panels, you should take it in from there too....it depends on the type of jacket also,,,,im picturing a tailored jacket....so it would be harder to alter....
Otherwise,,,,your best option would be to take it to a dressmaker to alter it for you....
i'll take that as a compliment
. 
I've never really made my own garment though... just a few trinkets and simple things like cushions and stuff.
you must post pics, when you have finished!