Unexpected obstacle in a motorcycle class

I'm taking a motorcycle class at the local college (which, BTW, I would 100% recommend to anyone who wants to gain some skills and confidence on a motorcycle). Last night we were riding a lot on the bikes and doing some slow-speed maneuvering. After a couple of hours of this my upper back was getting a bit sore so when I was sitting on the bike taking a break for a couple of seconds I stretched out my back. I was moving my shoulder blades together (sticking my chest out), then doing the opposite and rounding my back out. I did that a few times before it was time to start riding again.

So I was doing figure 8's on the bike and concentrating on what I was doing when I realized something felt funny. I kept riding to the next obstacle and did that maneuver too. Partway through I realized what was wrong.... my bra had come undone during my stretches and I was riding around completely unsupported! Talk about letting them flap in the breeze!

I figured we were close to the end of class so maybe it would be okay and go unnoticed (I was wearing a leather jacket so it wasn't too obvious) until we finished up. So we are riding around a bit more when the instructor pulls us all in and someone happened to mention that there was an hour left in the class. So I turned off the bike and said "I have to take a break" and started walking into the college building. I'm sure they all thought I needed to go to the bathroom (which is technically where I went) but there was no way I was going to keep riding for another hour with my boobs unsupported and an undone bra hanging off my shoulders..... no bloody way!