Introduction to the Modeling Cloth Add-on
Jan van den Hemel writes: The Modeling Cloth add-on adds a lot of functionality for working with cloth objects. For example, you can grab the cloth object and manipulate it while it’s being simulated. This video gives a brief introduction. https://youtu.be/xSosmySYcpQ

Very nice little add-on – I think it’s been around for a while but useful and fun. I wish wish wish that we can get a GPU cloth engine for Blender however!