Trilby was created almost 10 years ago, in 2008. She reincarnates periodically and starts fresh. Trilby 1 was pre-mesh. Trilby 2 had a mesh body. Trilby 3 added a mesh head, and Trilby 4 is bento. Her horses have changed quite a bit too.
At the far left is Trilby 1 on her Friesian, Virgil, from AKK. Pre-mesh, this horse was state of the art, with 16 or so legs that lit up in a series to give the impression of movement. It was brilliantly done, like a film or a flip book. Trilby won the Steelhead Horse Race on this horse, sidesaddle. The size could be changed, which made it very popular during the petite craze.
Next over is Trilby 2 on her horse, Calliope, from KOT. One of its creators was in Trilby's riding club, the Mount Caledon Troopers. Trilby 2 went wild over this horse. It actually had 4 legs that moved, and had very realistic animations. One could change the color with a hud. Sidesaddle was not available, and because of the way the mesh was rigged, you couldn't wear your own shape. Still, it was a thrilling advance.
Let's skip to the far right where Trilby 3 is on her horse Dante, which is the first mesh horse from AKK. This horse was rigged so that you could wear your own shape. It was modifiable, and the color and size could be changed. Sidesaddle was also available.
Second from the right is the current Trilby on her horse, Hopkins. This horse is from Water Horse. They started out making horse avatars, and this riding horse is just as beautiful. Everything can be modified, and tons of accessories are available, including a sidesaddle AO and different gaits.
Trilby 5, not yet introduced, is already looking forward to the next innovation.