I used to live in The upper Mid Atlantic area and fished for trout year round. When fishing I often would stick to a fly that was producing until there was little left on the hook except the wings and head. Some flies made it for several days and others were torn to shreds in a single evening.
Whether you fish dries, nymphs or streamers, if you have had a good days or a good weeks fishing while using the same pattern post it up. If you have a picture of the actual fly, great, if not a quick pic of a copy is good too. Show us the one that 'Got er done'.
Don't have one for this week, but two weeks ago I fished the upper Deshutes, and Matolius Rivers. The fly that I couldn't take off that week was a red "Copper John". Lost some in the rocks but got home and tied a bunch more plus ordered some different colored wire.
This week I've tied a bunch of "batman's", and "sparkle prince nymph's" that I'll try next time on the water.
I fish that fly as an emerging Callibaetis mayfly. I cast it out and let it sink to the desired depth. I use an full intermediate sink line with a 12 foot leader tapered to 6x. Once the fly is at the depth, I slowly strip it in with an occassional pause.