A school

Bill made his way to the high school he worked at, all too aware of how under dressed he was. He was a teacher, having graduated a decade ago and working at this current school for about 4 years. As he entered, a bit before the students should start to show up, he considered what he should do. Entering the teacher's lounge like this would be... awkward. He could imagine some of his more uppity coworkers flipping out as they tried to figure out what was going on.

He could use one of the public bathrooms meant for the students to change, or even the nurses office, he supposed. Hell, there was even a janitorial closet or something if it really came down to it. Or, he supposed, he could 'man up' and just change in the teacher's lounge.