Sometimes having a little more fabric is useful, depending on whether you are just sitting at a computer all day and not moving your arms, or if you have to be more active. I teach, so I'm in a tough spot with respect to shirts. If they are too tight, too short, etc. then when I raise my arm to write on a chalk board, the shirt can pull out too much. If there is too much fabric, then when I turn my back to the class they will see all this excess material. So like someone was just saying, having a bit of extra material to allow you to move is OK. The guy in the first picture cannot raise his arms and maintain that fit. Plus the shirt looks painted on. Don't forget that you can adjust your "tuck" periodically during the day as it will adjust regardless of how the shirt fits. I still think a slightly loose shirt tucked in looks better than these longer shirts worn untucked.