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How hard is it to dress appropriately for an interview?
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When dressing for an interview, keep it simple stupid (KISS). Either a white or a blue shirt looks good on literally every male on the planet (too pale to pull of white? go blue...). The traditional logic behind it can be found at http://putthison.com/post/754228450/blueshirtsorwhiteshirts (not my blog), with a better explanation of stripes at http://putthison.com/post/29484681861/patterned-and-textured-shirts-as-long-time
Want to go beyond blue and white? Try this one on for size http://putthison.com/post/32202336269/beyond-blue-and-white-its-been-said-often-enough
Disclaimer: I am not saying pastels, checks, ginghams, pinks, lavenders, etc can't look good. I'm just saying that for an interview it's better to play it safe. And as bitching as you might think your shirt is in solid red, green, grey, purple or whatever other pantone color you've found, the fact is, your silk (tie) should be the primary source of color and you shirt and suit should be complementing it in the background.