How Should A Suit Fit In The Arms. The seam on top of the shoulder should be the same length as the bone under it, and should meet the sleeve of the suit right where your arm meets your shoulder. However, there should not be so much room that your arm moves around loosely in the sleeve.
Horizontal lines mean it’s too small, excess material means it’s too big. The only area where you can have a few wrinkles is around your armpit underneath the shoulders simply because you need that for the range movement, otherwise, if you see a suit from the back and it’s very clean and hangs very neat and the vents don’t gap, i can bet you that the rest of the suit will fit well because something like that will never fit like that off the rack. There should not be a significant gap between the shirt cuff and the jacket sleeve.
When you check the fit, be sure to keep your arms down at your sides for accuracy.
Although often seen as an option item, the waistcoat is a fundamental part of a suit and can add significant panache to your attire. Your upper body usually gets noticed more than your lower your body, which means that the most important aspect of the suit’s overall fit is how the jacket fits. How should a suit fit? There should be sufficient material over the shoulder blade to allow for fabric to extend from under the armhole, thereby providing flexibility.
