If you can help it, try not to go through the TSA security check point with wet pants. It will lead to full pat down
I was in Raleigh, NC yesterday working at a construction job site. Due to the nature of the work I was involved in my pants and shirt ended up getting wet. After completion of the job it was a mad rush to make it to the airport to catch the flight back home, so I didn't have time to change clothes. When I went through the scanner, wet pants set off the alarm as if I had items in my empty pocks.
Pat down ensued until the TSA agent felt my wet pants and then told me that is what set off the alarm.