If I go to a store and try on pants from 3 different manufacturers chances are my "fits good" would be at least two different sizes.
This irks me.
This is why we look for clothing that has features such as tie waists, the best comfortable fabrics in the market, with sweat absorbing properties, discrete elastic, features that give wiggle room in the fit.
This allows us to keep to the S M L XL type of sizing, and allows you more freedom and confidence when ordering on line.
Remember when in doubt size up!
This is a general list using the sizing standard to the industry. Sizing may vary from different manufacturers.
All measurements are in inches.