Which was the style at the time

This weekend my grandmother told us that my father and his cousin once went to a party wearing white flannel pants and polka-dot shorts underneath. Apparently the idea was that the shorts showed through the pants. I just about died laughing, and I truly am sorry that digital cameras did not exist at the time. Today I spent some time looking for pictures of this fashion debacle from 1967 or thereabouts, but so far no mention of it on the interweb. Maybe it was their own particular fashion venture.