My last suit was otr 40r us. Different cut so size is not comparable. I first tried 50r at tom ford. It was clearly too small. Then I tried 52r it fit much better than compared to 50r but not enough. I think I made an error focsuing on the relative improvement of 50 vs 52 as opposed to if the 52r fit on an absolute basis. I work in a department store and I can't see why the staff wouldn't put you in a 54 to start off with and then work down from there. Best to err on a slightly larger size than slightly too small. This is my approach when fitting and selling suits. The suits I sell are rather slim fitting so if it doesn't suit their body type and after seeking advice from our tailor don't think we can adequately alter the suit - I suggest they purchase another brand of suit.