This pattern could be a scud or czech style nymph. With the trailing material is falls away from the established profiles. It could be explained as a ‘trailing shuck’ higher in the water column. But, maybe it doesn’t need any excuses. The excess materials have movement and colors to entice and provoke….hopefully. Experimenting with the depth and presentation may prove this ‘mistake’ to be successful. Part of the fun of tying is just experimenting.