The beginning of the pinch loop. The technique will greatly assist you in keeping the material atop the hook shank and prevent it from rolling to the far side.

The Limp Cobra provides a good tutorial on this fly tying technique that will greatly improve the application of materials to the top of the hook. This is particularly important on tying in tail or wing materials. As always, there is nothing stopping you from unwrapping and starting over if at first you start caddywhompus  (a seldom used Irish fly tying term :-))