>>529256703
Animations are applied to the skeleton, different costumes use different models but share the same skeleton. This way, it doesn't matter which model is used, as long as it has a compatible skeleton—one with the same bone positions and lengths. A rig is a skeleton with additional helper bones, allowing you to, for example, grab the foot and have the knee bend automatically via inverse kinematics. With compatible rigs, you can apply the same animation even if the skeletons are slightly different. Tl;dr it should not take much effort to port every costume to dorms