The first thing I do with any cream skirt is hold it up to the window, or if I'm in a shop with terrible lighting, just squint at it hard. Cream shows the weave and the lining in a way black never will, so you can tell in about two seconds whether it's going to be see through on a bright Tuesday or genuinely opaque enough to wear without thinking about it. That check has saved me more than once.
A good cream skirt earns the colour because the fabric has some weight and a proper finish, rather than looking like a white one that's gone a bit sad in a hot wash. Cotton with a decent density, a wool blend with some structure, even a heavier linen, all hold cream better than anything thin and floaty, which tends to look more like underwear than clothing. Check the lining too, because a cream skirt with no lining or a flimsy one will cling and crease and show every seam of what's underneath. The waistband and zip matter more than usual here as well, since a cheap zip under pale fabric often leaves a faint line you can see from across a room, and a seam that's been pressed badly shows up as a shadow that never quite goes away.
Where it falls short of being practical is obvious but worth saying anyway. It is not the skirt for a rainy commute, a toddler's birthday party with anything involving cake, or a first date somewhere with red wine on the menu. I wore a cream skirt to a barbecue once and spent the whole afternoon sitting very carefully, like I was guarding something precious, which rather defeats the point of a barbecue. It is, though, properly lovely with a plain white shirt and loafers for something that needs to look put together without trying, or with a navy jumper and boots once the weather turns, which is the combination I reach for more than any other.
In the shop, hold the fabric up to a window again, this time to see if it's lined properly, and run your hand over it to feel for any stiffness that will soften with wear versus stiffness that's just cheap interfacing and will stay that way forever. Check the stitching at the hem for puckering, and look at the inside of the waistband, because that's where corners get cut first.
The one mistake that ruins all of this is buying it without checking the lining and only finding out it's see through when you're already out the door and somebody mentions it kindly.