Not just true for (semi-)Formal

Ensuring a properly fitting neck on your jackets helps to give not only an air of elegance, but also the impression the wearer actually owns the suit. Unfortunately, this is of course largely an issue of make and fit.

Showing shirt collar - preferably an inch or more - gives a clean, finished touch to an ensemble and helps to flatteringly elongate the neckline. Done by simply holding on to the shirt-collar with one hand, and gently tugging the bottom of the jacket after putting it on with the other, this simple detail gives the impression the wearer knows what he's doing, and feels comfortable in a suit.
Done properly, few will realise why, but most will recognise one is dressed well.

Next time, show some collar.