Crocheting was making a hip and trendy comeback in the 1970s. This is a great ad for Coats and Clark wool yarn, which features his and hers “Rib Ticklers” that you could crochet yourself. These tight vests were a granny square/floral design in bright colors.
I remember this trend very well! Worn with bell bottom pants and a choker, you were a groovy stylin’ gal (or guy). 🙂