I wonder if they didn't make a recording error on those jeans. 34 inch waist is HUGE, absolutely HUGE.
I wonder if they just measured the opening of the waist instead of looking at the tag for the size? Because back then in the 70s didn't they wear their jeans much closer to their hips? I mean they obviously didn't wear them on the widest part of their hips because that would be halfway down their butt, but the measurement would be halfway between their waist size and their hip size.
If my theory is correct than the smallest part of her waist (ESPECIALLY if she were athletic) was much closer to 28 inches. I would say pants size she's probably a lot closer to an 8 than a 20 (She'd be about a size twenty if her waist measurement really was 34)
I'm thinking the "34 waist, 31 legs" part is supposed to go after the "jeans were found at the scene" part. I doubt it's standard procedure to take an inseam measurement on a deceased person.