Four sizes is ridiculous. The APC denim will stretch easily, so if you DID decide to go down four whole sizes, it would probably eventually stretch out enough for you to wear them comfortably, but the button fly would gap like crazy and you'd be fighting against the cut the whole way. At that point, why the hell aren't you just getting New Cures? Seriously, just buy an entirely different cut, you clearly didn't want New Standards in the first place. One or two sizes is fine. If you only sized down one, I'd expect them to end up a bit loose and a little relaxed, but not baggy. Just sort of "regular" fit. Two down usually ends up slim but not skinny. You could go down three if you wanted a skinny fit, but like I said, at that point you don't want New Standards, you want New Cures or KMW Rockers or JR Hobokens or something entirely different.