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Having just left a job in menswear, I feel compelled to comment.
First of all, in reference to the second link, don't...ever...wear pants like that. E...ver!
Secondly, when wearing a casual shirt like that, you should only unbutton the top button. Depending on the shirt, the environment, the event, etc., you could get away with doing the top two buttons, but I usually only do the top.
What Girls Said 2
What Guys Said 3
Two different styles.
But for the second one it would depend if you have a built chest. The more built your pecs are, the more you can unbutton down. Sometimes you would see men with 6 packs who unbutton down all the way.
BUT USUALLY..it should be no more than 2 unbuttoned. Especially if you're wearing an undershirt.