I have the opportunity to take a flyer on a Tom Ford suit (i.e., can't try it on). The suit is listed as a 48 with 17.5" shoulders (not sure how exact the measurements are). I'm typically a 48 (Canali, ISAIA, Hugo, etc.). Most shoulders seem to be 17.75" to 18". From what I've read, it is suggested that buying a size up might be a good idea for Tom Ford. Any experience with Tom Ford sizing relative to other designers?