When I was 15 years old and in high school, I had a mathematics teacher named Gertrude, who was very strict. She was a tall blonde woman in her early 40s who wore a long, billowy skirt and a tight, button down sweater that accentuated her large breasts.
She spoke with a heavy German accent and the kids in class would quietly snicker and laugh at her when she turned her back to write algebra formulas on the backboard.