Question about T-shirts: When wearing a button down long-sleeve dress shirt for example (without a tie), I have been told you always want to wear a T-shirt underneath it. But unless you get a V-neck T-shirt you will see the top of the T-shirt showing through. It seems the style I often see, including in Antonio's videos is where the top two buttons are unbuttoned and no visible T-shirt showing. So, what is the answer? T-shirt or no T-shirt, show a more open shirt with the top couple buttons unbuttoned or not?