Kern+12+Principles+of+Animation+Research

Follow Through and Overlapping Action

Even though the person may have stopped the clothing or any lose article will still be moving differently, this is to show real life movement almost. For example a person running, when they come to a stop their clothing and hair (if they have any) will move and stop differently than when they did. Example video:

https://www.youtube.com/watch?v=p6ps0U6lGIg

In this animation even though he comes to a stop against the wall the bag, his hair and clothing still move a little bit after and a little bit differently.