Elk Hair Caddis Tan - Caddis Dry Fly. Our #1 best selling Caddis Fly the Elk Hair Caddis in its natural and most commonly used tan color is just so productive. This is the Caddis fly used by most fly fishermen and can bring a wary trout to the surface even on those flat days. Make sure that you have a bunch of these in you box in a variety of sizes... you just can't go wrong.