I have a 7.25 in wrist. I wear 34 to 46 mm cases. 38 to 43 seems to be my sweet spot depending on the lugs, but there is one fundamental.... The man, or.woman wears the watch, the watch doesn't wear the man or woman. When you put on your first, well tailored suit there is nothing else like it. Watches are the same in experience. A fine time piece won't make you cool, so wear whatcha want ...