I'll chime in here. There is a big difference in construction of sporrans using horse hair vs. Goat. The hair that Kate is using is actually a pelt. I'ts actually somewhat deceptive as the hair is not really more than 10 inches long. As it mats on the pelt, it gives the illusion that the hair is really long. Horse hair is cut at lengths up to 40 inches and is sewn in layers on a panel then attached to a sporran front panel and trimmed to around 20 inches.
Goat hair is really gives a pleasing aesthetic to sporrans and I love Kate's version. Side note-When I work with this kind of Goat pelt, I have to wear a protective mask and glasses because the fibers are so fine, that they begin to become airborn and will lodge in your nasel passages and get into your eyes!