In the 1970's, they knitted things that weren't meant to be knitted.
It's as simple as that. If you want to make your own sweater, scarf, or baby booties - go right ahead. But in the 70's it didn't stop there. They made dresses, vests, toilet seat covers, and bathing suits (!) out of freaking yarn! For more direction on where to draw the line, see the What Not to Crochet blog.
Sometimes when I go to a flea market, I feel like an archaeologist looking for some buried remains of the distant past. Instead of dusting away the sands of a millenium, I'm digging through miles of junk just to land on that one rare artifact. If you look hard enough, within every flea market is hidden at least a dozen needlecraft books from the 70's and 80's.... and what a find they are.
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Wendy looks a tad embarrassed, would you say?