The moment slim trousers made sense to me was a Tuesday, flat loafers, a plain white shirt tucked in, nothing clever about it, and I caught sight of myself in a shop window and thought, oh, that's actually quite sharp. No blazer, no jewellery, just the line of the trouser doing all the talking. I'd spent years assuming slim meant tight and uncomfortable, the kind of thing you perch in rather than sit in, and this pair proved me wrong within about four hours of wear.
They're not for every day, though, and I'll say that plainly. If you're on your feet for long stretches, or you need to crouch down to lift something off a low shelf more than once an hour, slim trousers start to feel like a decision you're constantly managing rather than wearing. The fabric with no give at all is the worst offender here, it creases sharply behind the knee and stays creased, which looks fine for a desk but faintly ridiculous by the end of a long shift. A small amount of stretch in the weave changes everything, and I'd check for it before anything else.
Sizing is where most people, including me for a good two years, get it wrong. I kept buying my usual size and ending up with a waistband that gaped slightly at the back when I sat down, because slim trousers are cut close through the leg but still need to fit properly at the waist and hip, there's no slack elsewhere to disguise a size that's a bit too big up top. Try the sitting down test before you buy, not just the standing in front of the mirror one. If there's pulling across the front of the thigh when seated, or the hem rides up to show more ankle than you intended, go up a size rather than hoping it'll settle, it won't. The hem length matters more than it does with wider cuts too, half an inch too long and they bunch over the shoe in a way that undoes the whole clean line, which is, frankly, annoying given how much the shape relies on precision.
Where they genuinely come unstuck is with anything bulky on top. A heavy roll neck or a big structured jacket on slim trousers just makes the bottom half look like an afterthought, the proportions tip and nothing balances. Chunky boots can do the same thing if the trouser is very narrow at the ankle, you end up with a silhouette that looks slightly top and bottom heavy in different directions at once. Keep the top half fitted or at least not overwhelming, and save the oversized coat for a wider leg instead.
The one mistake I'd steer you away from is buying them a size down because they look neater on the hanger. They won't look neater on you, they'll just be uncomfortable by lunchtime.
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