A parachute-style Wulff dry fly in brown with a bright hot spot, from Montana Fly Company. The Wulff's bushy profile floats high and pushes a visible wake, while the hot spot adds a trigger point trout can lock onto.
Fish it as a searching attractor in rough water, or during brown mayfly and caddis hatches.
Fish the hatch, not the clock: watch the water for noses before casting, and place the fly a few feet above each rise for the most natural drift.