no one's gonna look down on you for wearing a clip on bow tie. Many, probably most people do, it's just that they can be seen as a bit tacky, in a light hearted way by people who have real ones- most people would wear a proper necktie over the elasticated ones you used to get in primary school. They're really not that difficult to tie once you get the hang of it, and do look better once you've practised it a bit.
Apparently, the OU navy unit requires an actual bow tie for some of it's functions, according to my next door neighbour, who spent many hours knocking on people's doors trying to get hold of one at the last minute.