Not sure if you already got em but, generally yes you should size down for stretching otherwise you are going to eventually have nicely worn jeans that are way too big in the waist/hip area. Take it from me I know. It is going to feel uncomfortable at first but if you wear them for long periods of time everyday for a week that feeling should pass. At first it should be quite difficult to button up.
11/12/11 at 12:48am