This video offers tips for making medium-length, thin hair appear thicker. The stylist emphasizes the importance of addressing the ends, mid-shaft, and roots of the hair to create a fuller look.
CHAPTERS DISCUSS:
* Trim off the thin bottom length.
* Layer the hair ONLY above your recession line that extends back toward the occipital bone (below that line everything should be one length).

* Use volumizing product that allows movement & texture.
* Color hair from scalp to about 1.5 inches out, only ONE LEVEL DARKER than your natural color (low lights), in order to create shadowing.
* Apply fiber to roots, the kind that does not fall out, rub out, drip out when moist, but does wash out at the end of the day. (Recommends Toppik fiber applied w/ pump applicator.)
Here is a long hair example: