Do men find the same problem, when trying to get men's clothes that fit?
Men, at least in the US (I can't say with any certainty about the rest of the planet), have it pretty easy. "Sizes" are given in inches, typically (for trousers) waist and inseam, and for jackets/sport-coats chest.
Of course the above yields problems for blokes that have "dimensional variances" from the "average", but unless one is purchasing a bespoke garment, there's enough "slop" built in so that the garment will mostly "fit" (for varying definitions of "fit").
Fortunately, guys don't have to deal with the vagaries of "sizing", much less "vanity sizing", that our sisters do. I've never managed to get my head around the notion of "dress size" (and its offspring sizes for skirts and most other things).
I know from practical experience that I (that is, "me") am roughly a "size 14", even though none of the listed dimensions actually match up properly. To put that in "guy terms", I have a roughly 38-inch waist (it varies according to how much food/beer I have "on board") and a 34-inch inseam (it used to be 36 inches, but I'm not quite the bloke I used to be); this is coupled to an overall height of 6-foot-4-inches. When it comes to skirts, I can pick between "tall" and "women's" sizes depending on the overall length I want (I suppose I could go to "petite" if I wanted something really short).
At the moment, I'm wearing a size 14 "tall" long skirt and it comes to just ever so slightly above my ankles; the designer laid the skirt out to fall at a woman's ankles when the wearer would be wearing moderate heels. It's a great skirt, although it's one that I only occasionally wear; it was nice this evening, though, because it's really cold tonight.
So, it would seem that for the average bloke the oft-offered advice of carrying a string equal to one's (waist) circumference and then halving that as a coarse measurement of waist-on-hanger is likely wise.
With some luck, and I'm not holding out much hope for this, sizes might someday be provided in proper 3-D measurements that specify (1) the waist size in either inches or centimetres, (2) the drop from waist to hip in the same units, (3) the circumference of the hips, and (4) the "outseam" (overall length) measurement. That'd allow
everybody to understand -- at a glance -- how an article would fit. As I say, though, I don't hold out much hope for that.