The case for spending seriously on a coat rests on a simple arithmetic: worn four months of the year for ten years, a coat gets roughly 240 days of use. Divide the purchase price by 240 and the cost-per-wear calculation changes substantially. That logic holds, but only if the coat survives the decade, which is where construction becomes more important than cloth or label.
Cloth weight and composition
A coat cloth should have body. The weight you are looking for depends on the garment: a casual wool overcoat for daily urban wear in a cold climate needs 20–24 oz per yard minimum to hold its shape through compression in a crowded subway and still hang properly after. A more formal town coat in a finer fabric can be lighter, but the construction elsewhere must compensate.
Double-faced fabrics, where two layers are woven and bonded without the need for a separate lining, are the most refined option and the one that tells you most clearly about a coat's quality. The interior of a double-faced coat is clean and smooth. There is no lining to crease, bunch, or fail at the hem. This is not a common construction because it is expensive; finding it is a reliable quality signal.
Cashmere overcoats are a genuine luxury and a genuine maintenance commitment. The fibre is warmer per gram than wool, handles beautifully, and drapes in a way that no other material quite does. But cashmere pilling and cashmere vulnerability to moth are not myths. If you are buying a cashmere coat, you are buying something to care for, not just wear. Store it folded, never hung (hanging stretches the shoulder); use cedar; dry-clean with a trusted cleaner who handles fine cloths. Understand this going in.
Melton wool is worth knowing by name. Densely milled and heavily finished, it is almost windproof and highly resistant to water absorption at the surface. It is used in the best peacoats and in traditional naval and hunting coats. It does not drape; it holds. That is its purpose.
What the interlining tells you
In a jacket, the interlining is canvas, horsehair or synthetic, and whether it is floating (canvassed) or glued (fused) determines whether the front of the jacket will mold to your chest or remain stiff and separate from it. In a coat, the interlining is most often felt, domette, or a similar dense batting. The relevant question is how the interlining is attached at the hem and lapel.
At the collar, the two layers of cloth should be held together by hand padding stitches: small, diagonal stitches that allow the collar to roll naturally. Collars held together by machine stitching around the edge will not roll in the same way and will press flat when the coat is steam-pressed, which is fine for some styles and wrong for others. A high roll on a turn-down collar is a sign of hand work.
Buttons
Buttons are the easiest place for a manufacturer to save money that is immediately visible on close inspection. Horn buttons are warm-coloured, slightly translucent, and variable in pattern; no two are identical. Corozo, vegetable ivory from South American palm nuts, is similar in appearance and almost identical in quality. Resin buttons can be convincing from a distance but feel light and cool-smooth in the hand; the material is also prone to cracking under the pressure of a hot iron. Metal buttons are appropriate on peacoats and military-inspired styles.
If the buttons on a coat are covered in matching fabric, the signal is that the cost has been saved somewhere. This is not always wrong, a perfectly made coat with covered buttons still has covered buttons, but it is worth noting, because it suggests a place where the manufacturer chose speed over statement.
Seams and finishing
Turn a coat inside out. The seams should be flat-felled or pressed open and bound, clean, with no raw edges visible. A well-made lining will be inserted with a generous pleat at the hem and back vent to allow movement without strain. If you can see the lining being pulled by the outer fabric in the shoulder area when worn, the lining was cut too short or the construction was careless. Both are problems that compound over time.
On the outside, look at the pockets. A well-set welt pocket, where the fabric is cut and the lips are clean and level, requires skill to execute. A poorly set welt will pull open at the corners. Patch pockets are forgiving to make and fine; flap pockets vary. Button-through pockets are an investment in accessibility.
What to actually buy
A coat in a classic cut, notch or peak lapel, single-breasted with three or four buttons, falling below the knee, will remain appropriate for the length of its useful life. The current-season silhouette in a coat is largely irrelevant if you expect to wear the piece for a decade. Length can be adjusted upward by a tailor; it cannot be extended.
Dark navy and mid-charcoal are the most versatile colours over time. Camel is beautiful and legible but narrower in its application. Black coats in any quality of cloth read as formal or urban in a way that suits some wardrobes and not others.
The quality of a coat is written into the cloth, the collar, and the buttons. None of these are subtle once you know what you are reading.
Spend what is required to get the construction right. Everything else follows from that.
