The question I get most is whether jeans actually count as proper work wear or whether you're pushing your luck. The honest answer is that it depends entirely on what you put them with, not on the jeans themselves. A dark, straight leg pair under a blazer reads completely differently to the same jeans with a slogan tee, and most workplaces that allow denim at all are judging the whole outfit, not the fabric.
What separates a pair that works from one that lets you down comes down to wash, cut and how they sit when you're sitting down for seven hours straight. A proper dark indigo or black with no fading or whiskering looks closer to trouser than to weekend jeans, and that's the whole trick. Construction matters more than people admit, too: a bit of structure in the denim so it doesn't bag at the knee by eleven in the morning, a waistband that doesn't gape at the back when you reach for something on a low shelf, a rise that doesn't show anything when you bend to pick up a dropped pen. Cheap denim goes soft and saggy within a few wears and starts pulling across the front of the thigh in a way that looks tired rather than relaxed. The better ones hold their shape through a full day of sitting, standing, walking to meetings, and still look crisp when you're on the train home.
These suit the kind of work that's smart but not suited, the office that's gone a bit more casual, the creative job, the Friday when everyone quietly loosens up. They're better for autumn and winter than high summer, mostly because a decent pair of dark jeans wants a jumper, a blazer or a proper coat over the top to earn its place, and that layering reads more convincingly as work than jeans on their own with a t shirt. A long cardigan or tailored jacket over the top does a lot of the heavy lifting, hiding any gaping at the waistband and giving the whole thing a shape that looks considered rather than thrown on.
In an ordinary wardrobe, the jeans that work hardest are the ones that go straight from a blouse and loafers in the morning to the same blouse with the jacket swapped for a coat on the way out. A silk or cotton shirt tucked in gives a waist without needing a belt to hold the shape together, and a low heeled boot or a simple flat keeps the whole look grounded rather than dressy or scruffy. I'd be looking hard at the ones that don't need ironing after they've been balled up in a bag all day.
