I wanted to say a few words about this admirable suit/tie/shirt/pocket-square combination independently of the question of jacket fit, so I’ve cropped the picture to focus on the former.
I think this is really tasteful. Note how nicely the dusty matte finishes of the suit fabric and the tie work together (and this is a good example of how to incorporate a —how to put it? —not-quite-SF-approved tie into a conservatively subdued ensemble), whilst the colors and patterns of the two contrast with each other in a way that benefits both. The solid shirt (very pale blue on my screen as I hope it is in real life) is the perfect unobtrusive backdrop for these and I don’t think it could be improved upon. I daresay nine out of ten people would have gone with a lighter pocket square, which would have been OK I suppose but would have detracted from the overall gestalt by needlessly distracting the eye. The darker square does exactly what I’d want it to do here: provide the final subtle grace note.
(I might quibble about the tie knot but I tend to obsess over those, it a personal matter, not a point of principle.)
As you may have gathered, I like this a lot.
Yeah, the knot sucks. This is an example of a thin silk with wimpy lining. It can make a decent knot, but it won't hold. That's what happened here. By the time I got around to taking the picture in the afternoon, it had devolved to the mess you saw.