We measured a sampling of these jeans of different waist sizes and lengths and find they are NOT vanity sized which is counter to what you would expect from most other jeans you’d buy these days. They measure out to the stated size at the full stretch of the waist and are pretty true in the length. And of course, these are denim and may shrink just a tad too. So my overall advice would be to go up one size from the waist size you normally wear in jeans; you’ll likely find a fit. If you aren’t sure whether your jeans are vanity sized like I’m describing, then either measure your waist where your normal jeans ride or measure your favorite pair of jeans to verify. Again, casual jeans and most riding jeans these days actually measure out about 2” above the stated size but this style does not! You’ll probably find that you measure out a bit bigger than your normal jeans stated size and also the waist of your favorite jeans measures out an inch or two bigger than their stated size. If so, you will be on track following my advice. Or to make it even simpler, just measure those other jeans that you like and find comfortable and whatever they measure out to buy that size!
The inseam lengths measured out about 1 inch shorter than the stated size. You may want to choose a longer inseam than your ordinary jeans for a couple of reasons. First, jeans ride up your legs when you sit on a motorcycle so to maintain a good length, you can choose one size longer. So with those considerations in mind I’d recommend you buy one size longer than you normally wear. If between sizes, choose the longer.