Men's Outerwear
Outerwear fit is judged differently from a shirt or a t-shirt: the question isn't just “does it fit my chest” but “does it fit my chest with whatever I'm wearing underneath it.” A coat sized to your bare chest measurement will feel restrictive over a sweater. Brands vary a lot in how much layering room they build into a given size — some cut outerwear slim by design, others intentionally roomy.
The shoulder seam is the single most reliable fit point on a coat or jacket, because unlike the chest or waist it can't be fixed by sizing up or down — sizing up to fix a narrow shoulder just adds bulk everywhere else. If a retailer publishes a shoulder-to-shoulder measurement, it's usually worth more than the chest number for judging fit.
Insulated pieces add one more variable: heavier insulation adds real bulk, not just warmth, so a true-to-size chest measurement on an uninsulated shell will not describe an insulated parka in the same size. Compare garment measurements, not just the size label, especially when moving between a brand's lightweight and insulated lines.
Men's Outerwear at retailers

COS
Tailored Wool Long Coat

COS
Single-Breasted Wool Long Coat
asos
ASOS DESIGN wool look coat in brown
asos
ASOS DESIGN wool look coat in navy
asos
ASOS DESIGN oversized longline wool look coat in mole
asos
ASOS DESIGN wool look coat in brown
asos
ASOS DESIGN wool look coat in navy
asos
ASOS DESIGN oversized longline wool look coat in mole

COS
Double-Faced Wool Long Car Coat

COS
Double-Faced Wool Short Pea Coat
Calvin Klein
Calvin Klein Men's Double-Faced Wool Blend Reversible Coat - Blue - S

Uniqlo
Wool Blend Short Coat

Uniqlo
Wool Blend Short Coat
asos
ASOS DESIGN wool blend oversized coat in brown
asos
ASOS DESIGN wool look longline coat in camel
asos
ASOS DESIGN wool look oversized coat in brown check
asos
ASOS DESIGN oversized mid length wool look duffle coat in brown
asos
ASOS DESIGN wool look over coat in grey
asos
ASOS DESIGN wool look longline coat in camel
asos
ASOS DESIGN wool look longline coat in grey