hey nylon bits i found the skinny zips (in the waist at least, obviously they are tighter in the leg) are actually a more generous fit than the lean beans. which skinny zips are you interested in? if the phoenix suns they stretch at least a size so make sure you get them tight to begin with.
also, tiffany7, there are loads of fake phoenix suns around, the best ways to tell the fakes is the quality of denim is very low, the stitching is often in the wrong place or missing and the fit will be all wrong - safe to say that most on ebay are fake and i would only buy these from a shop.