These days, long neckties are banned in hospitals because they transfer infections. Your bow tie-wearing doctors likely figured this out for themselves years ago, and settled on a bow tie as an alternative way of looking presentable. For a certain generation of doctor, it'd be unforgivable to appear in front of a patient in an open-necked shirt. (A cravat, of course, being suitable only for confidence artists, gigolos and Europeans.)
- clown
- english professor
- that is all