Ignore the people saying to wear black. As stated earlier, black is for funerals and formal events. Dark navy is a solid choice. With a white or very light blue dress shirt. Wear a tie with some red in it. Would also work with a navy blazer and charcoal, grey, or khaki colored pants. Depending on the job and your personality. Wear any shade of brown shoes. "If you look good, you feel good. If you feel good, you play good. If you play good, they pay good. Now that's good." - Primetime
You're thinking about it too much. Doesn't matter how you look. If you're one charismatic man with a sense of know-how, the job is yours.
Also, ignore the people saying that it doesn't matter how you look and what colors etc... These things are subliminal, and first impressions are HUGE when it comes to interviewing. The fact that you're asking these types of questions speaks volumes and you're definitely on the right track.
Yes get it tailored. It makes a huge difference. I got an off the rack slim cut suit tailored for a wedding and got probably 10-15 compliments about how good the suit looked. I felt like James Bond and I look for excuses to wear it now. To echo a few tips: No pleats, no cuffs and get a slim/narrow cut and lapels and get it tailored. Go for a dark blue or charcoal. Buy 100% wool, it makes a difference. You don't want to look like the guy on the left.
I've worn a navy blue suit to every interview I've been on and have gotten a job offer every time. Granted your resume, experience, and interviewing skills come into play but I do look good in a navy blue suit.
I don't even own a black suit and I used to wear a suit to work every day for 5 years. Now I only wear golf polos, khakis and boat shoes. I'm on mobile so can't post emoticon with the sunglasses
The studies are crap, but if you're wearing a suit then yes; a darkish navy blue, black, gray or charcoal are the only good colors. Unless it's a law firm, government office, big 5 accounting or bulge bracket financial firm or bank, you can probably get away with dress slacks, tie/no tie, and a matching dress shirt; at which conversely enough may be any blue but navy.
I'm in finance, and I go with blue shirt and black suit for interviews. For a conservative/traditional company, go with navy blue or black. For a tech company or startup, you can (and probably should) be more creative.