On a non-casual day, the dressing code in most organisations is purely official. However, if you have a good graphic Tee Shirt to show, you can construct it into your wears and still appear official and participate in the board room.
Tuck in the Tee Shirt into a tailored pair of trousers( not jeans at all), and a fitted blazer. This will not only make you look very corporate but also adorable.
Avoid Tee Shirts that have readable or bizarre or distracting inscriptions. Such inscription could go on a casual day if you must wear them. Next, it makes more sense to let the colour of the pair of trousers agree with the Tee Shirt.
See Fashion and Style
