Unfortunately, that isn’t quite right for guys. Skinny, straight, relaxed…. All these types changes the fit and sizing. I wear one waist size larger for skinny.
Women’s are much worse sizing wise but the difference is that guys jeans generally just look acceptable . When a woman gets jeans that fit her correctly, they can look amazing. I doubt guys ever get compliments on the fit of their jeans.
For women, they could use 6- measurements to standardize it but unfortunately a lot of people fall for vanity sizing and don’t want to accept that they gained weight.
It happens for guys clothing too. If it is a letter based sizing there are huge variations in sizing between clothing companies. For high end brands I wear a large, at Walmart or other box stores, I wear a small.
I have seen a regular and long but only on high end brands. Abercrombie and Fitch is a good example. Their tops have a size and length.