I was lucky in college that another student ran up to me to tell me my dress was tucked into my panties as I came out of the bathroom. I had walked all of 50 yards (un)dressed like that.
Also in college, I had to "dress for business". I guess my pantyhose were a little old as I rarely wore them back in those days. Nobody did! I felt them falling as I walked to the car. There was no bathroom near by without walking back to the buildings. There was no inconspicuous way to pull them up in the lot. I just kept walking and wiggled some and kept praying for them to stay up. As soon as I stopped to put the key into my car door, they completely fell to the ground! Phew!