In prewashed jeans I normally wear 32 in waist size. In dry jeans I get along best with 30 in which I have my AJ as well... However, my APC NS is in 28 and after one month of daily wear I don't notice any difference to the AJ. Of course the APCs have a bit slimmer fit in the thighs but you should also keep in mind that the APCs stretch most in the waist area. So you could get a problem that the jeans will start to slip if you don't use a belt.... I would suggest you take the 31 cause this pair will honestly stretch a ton and they will feel really fine and relaxed after some days of wear!!