Even if a girl were to dress conservatively, 'things' can happen. Around 1980 my wife taught at a small school in the Midwest. When they had field trips, I often went along as a volunteer chaperone. On one trip, to a many-flagged amusement park, one of the other teachers who came along was a very attractive woman of Mediterranean descent. That lady wore a white, linen-ish pantsuit that looked very professional.
Then, we wound up on the log flume ride...and we found out how transparent that white fabric became when wet. She was sitting directly across from me on the ride (and my wife was alongside me) and got soaked from midriff-down. It was very evident that she didn't shave her nether regions..
F