The point about the office wear is very true. Washington is known for very business and professional clothing. And, even though DC is in a slightly warmer climate than say NYC, it would be nuts for a lady, and I am one, to not wear nylons during spring. The weather changes frequently so pantyhose would be a plus. And for sure in the early 90s you would absolutely be wearing pantyhose with a skirt. It's just not normal to be bare legged at the time.