All of a sudden I thought of sociology when...

I had a volleyball tournament this past weekend. I realized how us girls do things in the gym, that we wouldn't necessarily do out in public. We walk around in butt-hugging spandex, and change  in the middle of the hallways. That's what gets me the most, that we just throw our shirt off and change, and it's acceptable! I don't quite understand what makes this one thing different from the other. How is it that changing out in the public, for everyone to see, is allowed here? I looks to me that volleyball has adopted it's own set of folkways and norms.