All of these improvements have been made with the focus to create a better user interface that is not only easy on the eyes but also intuitive to navigate. The KATTUI texture pack focuses more on improving the UI of the game rather than the environment where you play. Slimmer bodies for all characters and NPCs make them feel more human and there are more improvements made to the torso and legs that make it look more pleasing. All your armors will look better and not just pixeled blocks from now on.