It clicked for me with a plain white shirt, a pair of beige trousers and nothing else clever going on, stood by the door trying to find my keys before the school run. I caught sight of myself in the hall mirror and thought, that looks like I tried, and I hadn't, not really. That is the whole appeal in one outfit.
Where beige falls apart is next to anything else trying to be neutral in a slightly different direction. Put it with a stone bag or a taupe cardigan and suddenly you look like you got dressed in a room with the lights off, everything almost matching and none of it quite. I have made this mistake with a camel coat that I was convinced was the same family as my trousers. It was not. It was a cold beige, mine was warm, and together they looked like an argument. Black and white both work, navy works, a bright colour works better than you would expect, but two neutrals in the same postcode is where it goes wrong.
Before you buy, check the lining if there is one, because some beige trousers are cut from fabric thin enough to show every seam of your underwear in daylight, which nobody warns you about in the shop's artificial lighting. Check the fastening too, a hidden hook and bar sits flatter under a shirt than a visible button, and check whether the beige leans pink, grey or yellow, because they are not interchangeable and the photo on the website lies more than any other colour I have bought. Hold it up against a window if you can.
Fit is where beige really tells on you, more than black ever would, because there is no forgiving shadow to hide a baggy knee or a waistband that's gaping at the back. Go for your true waist size rather than sizing down for the look of it, a pair that's too snug pulls little lines across the front that catch the light like nothing else. Watch the rise too, anything too low with this colour reads as pyjama bottoms rather than trousers, and anything cropped needs to actually sit above the ankle bone, not two inches above it, or you end up with a proportion that makes your legs look like they belong to someone else. If you're petite, straight or slightly tapered holds its shape far better than wide leg, which can swallow you whole and then drag on the pavement by lunchtime.
Would I buy these in a colour that shows every mark on the first wear, or am I just enjoying the idea of looking pulled together on days I absolutely am not?