I have a huge shoulder width, so whittling the chest is a perennial problem for me, and I know this issue well from 15 years of experimenting with various tailors. Look at a suit as a rectangular box. Taking in the center seam in the rear reduces the width of the back of the box. Taking in the side seams reduces the thickness of the box, and to some extent the width of the back. However, as someone else indicated, there is no seam available with which you can readily cut down the width of the front of the box, at least up high where the chest measurement is taken. Could you move in the arms? Only if you want to diassemble the entire arm on each side, recut a new arms eye (my usernamne is a pun on this term), and throw the position of the breast pocket off-center. How bout the front darts? Not much help, since they're set too low, and can't rise much without hitting the breast pocket. There are only three techniques that can be used, to the best of my knowledge: 1. The so-called "Campagna chest cut", which is an old tailoring technique reinvented, involving a near-vertical dart behind each lapel, and sometimes a second dart at right angles to smooth the vertical one out. It actually pulls in the shoulder and the upper chest, so it won't work if you need shoulder width. It also requires a knowledgeable tailor and a canvassed suit. 2. A deliberate British-style padding of the upper chest, which in essence fills up part of space with padding. Can look good, but your Schwartznegger impersonation evaporates when you doff your jacket. 3. On a double-breasted suit with a 6-on-2 design and a high button stance, I have found you can achieve a modest degree of lower-chest adjustment by rejiggering the crossover. In essence, you increase the degree of overlap an inch or so by moving the fastening buttons outward, which simultaneously brings in the lower chest, raises the button-stance meeting point, and gives the suit more of that Thirties "high-set" look. You can't take it very far, however (an inch each side, 2 inches total), and with a canvassed suit you'll need to pay attention to the natural lapel roll point.