In Summer 1979 wooden mules with high heels and thick soles were a feature.
Here are some scans from a catalog of the time.
For Collectors 1977-1978; Woodenslides.com is totally dedicated to female fashion of the seventies. Site contains a bunch of vintage magazines, catalogues, review scans and pictures from 70’s movies. Pictures are about Clothes, Shoes (sandals, wooden slides, and clogs) and accessories.