[sritch]

Not that I wouldn't take fashion advice from HN, but I would never take fashion advice from HN. I can guarantee there are more important things you can do to change your appearance and 'have an effect' than wearing a bow-tie. An example would be having a proper fitting suit, which most men can't seem to understand. This can show attention to detail.

I'm not going to go on because frankly there is probably a threshold for interviewers - if you look like shit, its a bad thing, if you are passable then that is status quo. It won't matter how well you dress beyond that unless you're being hired as a stylist.

[troutwine]

Well fitting clothes--suit or not--that are clean, a hygienic personal appearance and good posture will go a long way. If you add in some basic manners and tact you're ahead of the game.

[masukomi]

at no point was it suggested that the bow tie was the most important thing you could do. As @troutwine suggested, being clean and hygenic, and having manners goes a long way, and I would argue are all far more important than what tie (if any) you are wearing. You are absolutely correct in your implication that a well fitting suit trumps a bow tie. This does not mean that a bow tie would not ALSO be a good thing.