Grey denim sits in a strange, useful space between black and blue, close enough to indigo to keep the practicality of a denim skirt, muted enough to avoid the slightly try-hard energy that pale blue washes can carry in daylight. The good ones behave like proper denim rather than a fashion imitation of it, with a fabric weight you can feel and a rigid enough hand to hold shape at the hem instead of curling under by midday. Look for a wash that reads as genuinely grey rather than blue photographed under cool light, since that is where cheaper versions tend to fall apart the moment they leave the shop.
Fit matters more here than colour. A midi length with a slight A line flatters more bodies than a straight pencil cut, which can look severe unless the denim has some give in it. Anything with a proper waistband and a fly front tends to sit better than an elasticated version, which reads as loungewear rather than as a skirt built to do daytime work.
Stitching detail is worth checking too, since a well constructed one will have flat seams and a hem that has been finished rather than simply cut and left to fray in an obviously deliberate way.
Styling it is less about reinvention and more about knowing what it quietly replaces. It does the job of a smart trouser for anyone who finds trousers restrictive, and it does the job of a plain skirt for anyone who wants texture without pattern. A fine knit jumper tucked in, a boot, and a longer coat is the easiest formula for fifty percent of the year.
In warmer months it takes a simple white shirt or a fitted t shirt without asking for anything else, and a low heeled loafer or a clean trainer keeps it looking considered rather than thrown on.
Occasion wise, this is a category built for the in between moments, the days that are not quite smart enough for tailoring and not quite casual enough for jeans. It works for daytime meetings, for lunches that might turn into something later, for travel, for the kind of weekend where you want to look like you tried without it being obvious. Grey denim in particular photographs well against neutrals, which makes it a genuinely dependable choice for anyone who dresses with a camera, a client, or simply their own mirror in mind.
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