with t-shirts, because they are a jersey knit, the fabric will not really fray.
how they did it in the 60s/70s on t-shirt jersey knits, was cut into the shirt in thin strips and make a knot at the end of each strip "Fringe". The knot at the end of each fringe will add a little weight to the fringe tip and make it hang better.
I think this is the simple easy wayt to get it in the grooooove.
