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A scarf suits almost anyone, honestly, which is rare for an accessory, but the thickness matters more than men give it credit for. If you've got a short neck or you're already wearing a bulky coat, a chunky cable knit scarf wound twice round will make you look like you're hiding from someone. Thinner, finer knits do more for most builds, and anyone who runs warm indoors should think twice about wool and go for something lighter they can pull off in a lift without unravelling half their outfit.
If you own none, start with a plain merino or lambswool scarf in a mid grey or a deep navy, long enough to loop once and still hang with a bit of length, because that one piece will go over a plain navy coat, a grey overcoat, even a denim jacket on the milder days, and you'll reach for it more than anything patterned you buy later. Colour wise, the ones that get worn are greys, navy, bottle green and a soft camel, because they sit quietly against most coats instead of arguing with them. Bright colours and busy patterns look great on the shelf and then spend most of winter in a drawer, which is a pattern I've repeated more than once myself. A fine check in muted tones is the furthest I'd push it if you want something with a bit more character without it fighting your coat.
What separates a good one from a sad, bobbly disappointment comes down to the yarn and how it's finished. Proper merino or lambswool has a bit of weight and drape to it, it sits on the shoulders rather than standing up stiff, and the ends are finished properly rather than left to fray within a fortnight. Cheap acrylic blends go thin and shiny at the folds after a few wears, and you'll know within one wet commute whether the thing is actually warm or just looks it. Fringing should be even, not patchy, and the weave should feel dense when you scrunch it in your hand, not loose and gappy. A scarf that's going to last gets folded in half and worn through the loop rather than wrapped loose and flapping, both for warmth and so it stays put under a coat collar on a windy platform.
Check the fibre content tag before anything else, because that single line tells you more about how it'll wear than the price tag ever will.
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