Here's a bottom photo to better illustrate how the fly is tied:
One looooooong figure eight wrap, from front to back, pinches a horizontal crossbar of fibers to the bottom of the thorax, at right angles to the shank. Then you can see-saw the fibers back and forth with fingers from both hands until they are splayed out nicely. Stroke the horizontal fibers with a toothbrush if need be.
Then add a dab of glue and it's done. This fly was made with ZapAGap. But it could just as well have been UV glue or water based fabric cement. Aleene's Stretchable Flexible fabric cement is the best for fly tying. It can be thinned down a bit too. With water.
The fibers here were brown dyed Zelon from Blue Ribbon Flies. But cheap commercial carpet scraps are much the same. One trip to the dumpster behind a big box store carpet outlet will get you a lifetime supply of Right Hackle fibers.