In aviation lore, the traditional removal of a new pilot's shirt tail is a sign of the instructor's new confidence in his student. In the day of tandem trainers, the instructor would tug at the student's shirt tail whenever he was getting himself into trouble or to signal him to do something. After the first solo, the new pilot is competent in the air and does not need such a safety device.
At Foothills Aviation LLC, we carry on that tradition. When you have completed your first solo trip, the instructor cuts the back of your shirt. Your shirt will be dispayed in our pilot's lounge for everyone to view.