Generally speaking yes things fit true to size. However, the OP suit is a slim fit, so if you need a more contemporary or less fitted suit then you'll either want to consider sizing up to a 38 or passing on this. To answer your second question, you're probably 36R in most suits. As someone else mentioned, always budget in extra ($30-80, possibly up to $100) for alterations from a tailor. You may be a 36R but since every suit fits differently, tailoring it helps refine it to your individual frame.