What stands out most to me is the disconnect between the upper and lower half. The very skinny trousers make your silhouette very unbalanced and also drape poorly (see how they cling to your legs rather than hang cleanly?).
Like the trousers, the jacket sleeves are a little slim (not as extreme as the trousers though). The effect is to make your legs and arms look disproportionately skinny relative to your torso.
Other issues: the buttoning point in the jacket looks low. The lapels are bowing, indicating some tightness in the chest.
You're not wearing shoes. I'm not as zealous as some people on that matter, but I think shoes are recommended with most suits.
Seriously though, I don't know if it's the angle of the shot that makes the buttoning point seem so low? I wear a lot of single-button jackets, and I find they need a lower buttoning point (I find the jackets become far more comfortable if I button them on my natural waist), but this looks really low. But like I said, might be the angle causing that effect.
I agree with the angle of the shot. That might be creating an optical illusion. The jacket seems to be too long but it’s not. I think the really low button stance is making it appear as so. It centers the eye too far down. Look at how long those lapels are!
maybe it’s because it’s a single button closure, but even then, I think it needs to sit a bit higher.
The button is better. But pants and sleeves are still too tight - look at how both bunch up - they shouldn't when arms & legs are strati. Your pants should simply drape and then break at the shoes and not bunch up. Sleeves shouldn't bunch up at all hanging strait. I can't put my finger on why the jacket looks off beyond the sleeves but ther'es somtehing about how it sits on you when buttoned. I'm sure someone with more background can pinpoint what that is.
Agree that sleeves and trousers still are too slim to hang cleanly.
Looks like you were buttoning the lowest button of the jacket, which was definitely not a good idea. This buttoning point looks better.
However the jacket still looks tight in the chest (bowing lapels).
The jacket buttons look closer together than I'm used to. Usually the lowest button is roughly at the level of the hip pockets. The hip pockets themselves may also be a little higher than I'm used to seeing. Is that what you're seeing @johng70 ?