The first wearing of my OH DB suit - the jacket sleeves are the right length but the shirt sleeves had ridden up. Jules, Lachy and Oscar were great in the process and I would recommend a visit. I'm very happy with the fit and am looking forward to wearing it some more:
I have slim-fit field jackets from TCNY and Trenery. The latter is probably what your looking for. I'm a 38-40 in the chest and I got a small which fits perfectly. It was also purchased during a sale at the time so may but be available now. Worth checking though.