There's at least 6 caddis species that look like that, only obsessives and other caddis flies can tell the difference. Try an emerger pattern in brown, trout mainly eat them as they hatch, that hackle fly is fooling nobody!
Limited fly choice, as only had a few on me. Were feeding on emergers but refusing dries as you guessed. Funnily enough were ignoring the huge mayflies drifting on by too.
There's at least 6 caddis species that look like that, only obsessives and other caddis flies can tell the difference. Try an emerger pattern in brown, trout mainly eat them as they hatch, that hackle fly is fooling nobody!