There's a particular kind of morning where every colour in your drawer looks wrong against your skin and your mood, and beige is the thing that solves it without you having to think any further. A beige skirt goes on when you want to look like you've made an effort without anyone being able to say exactly what the effort was.
It ages well if you treat it with a bit of respect, which is more than I can say for how I treated the first one I owned. Beige shows everything, a coffee drip, a bag strap rubbing a shiny line into the hem, a grass stain from sitting down somewhere you shouldn't have. Wash it less than you think you need to and spot clean where you can, because the colour fades unevenly if it goes through the machine every week, and a patchy beige skirt looks tired in a way that a patchy black one never quite does. A cool wash, inside out, away from anything dark, and it holds its colour for a proper length of time. Iron or steam it before wearing rather than after, since creases sit more visibly on a pale fabric and nobody needs that conversation with a mirror at eight in the morning. It suits the in between months best, those weeks in spring and early autumn when it's not quite coat weather but a bare leg feels like a bad decision, paired with boots and a jumper that does the warmth work the skirt won't.
Where it falls short is anywhere wet or muddy, so a beige skirt and a festival field, a dog walk, or a picnic on grass that's seen rain in the last fortnight, is asking for trouble. It's also not the one for very formal black tie evenings, it reads as daytime no matter how you dress it up, and against very pale skin a warm beige can wash some people out, so it's worth holding it near your face in the shop rather than just against your waist. Check the lining if there is one, because a cheap lining under a light fabric can show through under certain lights, and check the fabric weight too, since a flimsy beige can look cheap in a way a heavier one simply doesn't.
Get the shade and the weight right and it's one of the most useful things you'll own, no fuss, no shouting, just there when you need it.