The Calvin Klein sizing claims that my size, 35, falls into the category of Large (36-38). Im obviously on the smallest size of Large and found that the waste band is too tight. What they don't tell you is that most companies are switching to a wider, harder stretching waist band to prevent rolling on bigger bellies. This tougher waste band does NOT offer the same stretch as traditional bands, therefore they need to size these more appropriately so that we know what the heck to order without returning. I should also mention that I will be unable to exchange for a larger size because the rest of the material is actually somewhat loose overall. That means that if I got a XL (40+ waste), the waste may fit better but the rest will be very baggy. This isn't a good fit and they need to make major adjustments to these. I will attempt to order similar from a different company.