Most men treat a suit jacket as the easy part. The suit is the suit, they figure. What matters is the occasion. That thinking is how you end up in something that fits in the shoulders but pulls at the button, or reads as vaguely funeral rather than properly formal. A suit jacket done right is doing more work than it looks like it is. The lapel width, the button stance, the suppression through the waist, the way the chest rolls rather than strains. These details do not announce themselves loudly but they are the difference between looking dressed and looking like you dressed.
We have been looking specifically at jackets that earn the word formal without sacrificing any of the things that make a jacket feel like yours. Classic constructions, proper fabrics, cuts that hold their shape through a long day. Nothing that looks impressive on a hanger and falls apart in use. These are the ones that hold their end up.