<p>The Report Back, first from my two experts:</p>
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Since any well-dressed man is wearing an undergarment, this will show when the shirt collar is unbuttoned. This is not considered rude, and probably looks more professional than chest hair unless you're James Bond (no necklaces or medallions, please). This is all based on business attire for professional settings- what you wear off the clock is your own business (undergarments optional).
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Undershirt always, and avoid the "V" neck undershirts. However, a broad oval can be OK, so long as the line of the undershirt doesn't show through.</p>
<p>All in all, best to have the circle of the undershirt showing than otherwise.
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<p>And from the "Dress Smart for Men" book from the Simple Chic book line, which is my personal professional style guide:
[quote]
There is no occasion for which a white shirt is inappropriate. It goes with everything from a sport jacket to khakis to jeans, and when paired with a suit it sends just the right message: Neat and efficient. A white shirt with a straight collar works with any face shape and any coloring, but it will all be in vain if it isn't cleaned and pressed properly.</p>
<p>Like a white shirt, blue is an all-purpose choice. And in some ways it may be better. Whereas white may reveal a certain conformity, a blue dress shirt signals that you are your own man. Once again, keep it clean and pressed, and wear a white T-shirt underneath to keep it dry.</p>
<p>Never let 'em see you sweat
Interviewing can be a stressful-enough process without having to worry about perspiration. **The best defense against it? A white cotton undershirt. **Although perhaps counterintuitive because it requires putting on another layer, a white crew neck or V-neck T-shirt will keep dress shirts looking drier and make white shirts even brighter.
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<p>I consider my case rested.</p>