Most wardrobes hold three coats that almost work and none that truly do. The almost-coats are the expensive ones — bought quickly, worn twice, kept out of guilt. A single coat cut properly does the job of all three and asks for none of the guilt.
Start at the shoulder, not the hem. A coat is built or ruined at the seam where sleeve meets body: if it sits clean when your arms are down and does not strain when you reach, the rest can be tailored. A bad shoulder cannot be fixed, only disguised.
What a decade-coat has in common
Weight you can feel, cloth that holds a press, a lining that moves with you rather than against you. Wool that is milled rather than bonded. Buttons stitched with a shank so they sit proud of the cloth instead of puckering it. None of this shows in a photograph — all of it shows on the third winter.
Colour matters less than people fear. Ink navy, camel and a true charcoal each carry through five seasons of everything else you own. The trend colour is for the fifth coat, not the first.
Buy it a little roomy. A coat is the outer layer over knitwear, over a blazer, over a shirt — cut close and it fights everything beneath it. Cut with a centimetre of grace and it falls the way the maker intended.
One coat, chosen slowly, worn hard. That is the whole argument.