This question notwithstanding it remains that our larger culture did shift men into pants, knickers and breeches as a full time thing somewhere in the late 1500s. Now, this wasn't a sudden shift of course. After the middle ages, when men's tunics had risen to a height that didn't even cover their bootie, they began to wear trunk hose under the tunic, I suspect partly as a modesty ploy, but also partly to draw even more attention to the mid section of the body.
The presence of a somewhat skirted look in men's clothing continued, with the addition of the bifurcated garment under that, for quite some time, and eventually morphed into what we know as a man's suit. Over centuries the skirted tunic shortened or lengthened, but regardless of length or width, there was always some part of the upper garment that extended past the waist in a skirt-like way. This strange atrophy continued through the 18th and 19th centuries, where the shape we know as the man's suit took something approaching its modern form. And it was not until the 20th century that even the vestigial presence of a skirt disappeared from men's clothing. The appearance in attire of the jacket that ended at the waist meant that the skirt was symbolically gone.