The thing nobody tells you about a proper pair of blue jeans is that they don't look their best until about the third wash, once the indigo's settled and stopped rubbing off on the inside of your coat. Mine took a good six weeks before the knee stopped looking stiff and started looking like it belonged to me rather than a shop display.
Raw, dark blue denim and anything black above the waist reads like you got dressed in a hurry under bad lighting, so if you're pairing them with tailoring, go for a top that's doing its own thing in colour rather than fighting the denim for attention. On fit, the main thing to watch is the rise sitting wrong on you specifically, not on the mannequin. Too low and you'll be hitching them up every time you sit down in a meeting or a car, too high and they'll gape at the back waistband even on a flat stomach, because denim doesn't give the way a soft trouser fabric does. Sit down in them in the changing room, properly sit, not perch, and check what happens at the knee and across the thigh. If they pull tight across the front of the leg when you bend, that's not going to ease out with wear, that's just the cut being wrong for your shape.
Good denim has a bit of weight to it, you can feel it in your hand before you've even tried them on, and the stitching down the inseam should be even, not wandering off in a wobbly line that tells you it was finished in a hurry. Cheap denim goes thin and papery at the thigh within a month, you'll see it start to whiten in patches that have nothing to do with the wash it came in. The rivets matter more than people think too, a loose one will snag tights, jumpers, the lot, and once it starts working its way out there's no fixing it. In the shop, check the fly stitching hasn't been done on the cheap, run your thumb along the waistband seam and feel for it puckering, and have a proper look at the pocket bags inside, flimsy ones tear within weeks and you won't know until your phone's gone through the lining. Hold them up to the light as well, decent denim has a slight sheen to the weave, the poor stuff looks flat and a bit chalky, like it's already tired before you've put it on.
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