Old time fly fishermen worked a set or cast of wet flies (three or more) on snelled hooks. Such flies were still in demand in the late 60’s and early 70’s. I remember walking into Hank Roberts Shop on Pearl in Boulder and looking at these flies displayed on cardboard displays.
Fishing the wet fly properly an important skill for any fly fishermen and can be particularily rewarding for the beginner.
This is a photo of Joe Brooks in the late 1940's or early 1950's on the Madison River in Montana