I would second the idea of BB Milano. They also have a few pairs with some stretch (Lycra) in them that should hold their shape very well. Theory also does some cotton/stretch pants but they'll be more expensive and personally I've always found the fit a little weird.
As to the shirts, your measurements mirror mine almost exactly and I just ordered some of the CT tailored fit shirts after trying them in the NY store. So far they seem to be one of the better OTR fits for me, in addition to RLBL and some of Barney's house brand stuff.