The purpose of fringe was to provide camoflage, and to provide short "Strings" that could be cut off and used to tie up small game or items. If you have ever made a trap of sticks, or a lean-to for an overnight shelter, you will appreciate those fring "strings" even more. The shiny side of the hide is worn on the inside. The rough side is out. This elimiates the sun shining off the slick side of the leather to give you away in the woods. To be more effective, the fring on a coat or shirt should be placed across the shoulders, chest, upper arms, and back so that they hang down and break up the broad area of same color that is a " give-away" to enemy scouts and spotters. It also works well to cover your identity from Deer when you are hunting them, and trying to get close.
Prey species don't have binocular vision, and therefore have very limited depth perception. It doesn't take much difference in color that breaks up a large "splotch" of color for them to NOT recognize it as being a human. The fring strings should not all be cut to the same length, either.
If you don't learn to walk on game trails, only, and instead want to hump through the tall brush, any buckskin jacket or shirt, or pants, is going to see fringe catching on the brush. However, Indians, and long hunters learned to move quietly, and to follow game trails to accomplish that goal. They learned to push their way past bramble, rather than try to bull their way over it. That is the one part of the movie, " The Last of the Mohigans" that I thought was portrayed properly by the director.