Originally Posted by Snaap
@those people suggesting to take it to a tailor:
I dont know any good tailors in my area, at least none with whom I'd be comfortable cutting open a new suit.
Surely you can google some suggestions for tailors? If not, you can always find a reputable OTR suit store that's local to you and ask them which tailor they use for alterations. In my experience, the decent stores will generally use decent tailors.
Also, I wouldn't be too concerned about a tailor opening up a new suit. Very rarely will a tailor cut any material when altering an OTR suit, they just take in the seams. So if things go really wrong it's not too difficult for them to revert the garment back to its original state. Besides that, altering garments is supposed to be the tailor's area of expertise.
Like others have said, the jacket is too small for you. You should be looking for an OTR jacket where the shoulder fits as close as possible and then have the sleeve length and waist taken in by a tailor. However, I'm more concerned with your trousers. There is some obvious pulling at the bottom of the seat of the trousers. You can see how they get really tight at the bottom of your butt cheeks, which is a sign that the seat is too small for you. It's good to have trousers which are snug on your bum, but they should drape down from the middle of your bum rather than hug the bottom of it.