The act of manually closing a [[corset]] by pulling its strings, typically to make a person's waist appear smaller. To fasten a corset can be part of [[dressing]].

To unfasten (take off) a corset, you do not pull the strings, instead you untie the knot and then my pull the sides of the corset, away from the wearer. 
* !post #945821: example of [b]unfastening[/b] (the opposite of fastening a corset)
fastening corset