Today it's black slacks, black T-shirt, and a blue button down, untucked.
Down under unless its a business shirt, we normally wear our shirts not tucked in, even if its a "dress" shirt its fasionable to wear outside. The other exception would be if the shirt is too long. My daughter was aghast (trust me that is the right description) when I picked her up from school with my checked shirt tucked in (note it was too long otherwise), I got told to untuck it cause it looked funny.
So Maya is a fashionista, huh?
Ah the "to tuck or not to tuck" debate. We have a number of guys who will tuck their shirt in, and others who won't, either way is acceptable.
When I went to the recent NYC gathering, I wore my white button down tucked, so my Brokeback Mountain belt buckle would be visible. Mostly, I'm not a tucker.
Here is an example of how I look, taken in Colorado. The T-Shirt is tucked in, but the button down is left open, and untucked.