My favorate smallmouth fly is the Clouser Crippled Minnow.
The tail is marabou tied full for plenty of action.
Yarn body.
The head and collar are deer hair tyed like an exaggerated diver.
The fly is not meant to dive though, it floats on the surface on the hair collar and head, while the marabou tail waves tantalizingly below
This is not a well known fly, but it's very effective.
The simpler the outfit, the more skill it takes to manage it, and the more pleasure one gets in his achievements.
--- Horace Kephart