The sizing of men's clothes does at least relate to actual bodily measurements – waist, chest, legs – in everyday units such as inches and centimetres. There's a great deal of lying in what the manufacturers say, usually in the direction of vanity (if your trousers say 32, the tape measure probably says 35) but there is at least a underlying relationship to the human body, in contrast to the abstract unitless dress sizes. Unless, of course, it's just S, M, L etc, which it so often is.
But the fact that they can say
True to size, fit to waist
even if it is true, indicates that contact with reality is decreasingly expected.