Too much emphasis has always been placed on this whole subject and it's minutia such as whether a button-down shirt is a no-no (It's not, by the way). Forget about needing to look like another interview clone with a dark navy suit w/ plain red tie or risk tipping the scales out of your favor. NObody loses or gets a job because their shoes were wingtip instead of cap-toed. Use as your guide what any conservatively-dressed businessman wears. Wander through a Brooks Brothers store and look around.
What that tells you is to avoid faddish styles and/or colors. This means something single-breasted and dark; navy, charcoal, etc (for you Southerners, leave your seersucker at home). It does not have to be solid. Your tie does not have to be red. In fact, I think plain, red ties are manufactured only to supply the market created by "expert" interview advisers, because you rarely see one in real life. Aside from being conservative, here are the basic rules of what IS required:
Look good in your suit. Ask people if you look better in navy, dark grey, or charcoal and go with it. Make sure it fits by getting it tailored. It will be more comfortable and you'll be more confident and relaxed during the interview knowing it. Oh yeah, select something that you can wear at ANY function where a suit is required. The whole notion of an "interview suit" is silly in the first place.
Shine your shoes. Absolutely do this. Buy new ones if need be.
Don't stink, whether from cologne or through bad hygiene.
Thats about it
