A metal nose piece makes the mask safer and more secure on the face.
Metal or wire can be hard to sew through so I recommend using a pipe cleaner as the nose piece!
Hot glue the pipe cleaner around the nose of the mask. 2-4 inch pieces are best to use, they do not have to be very long pieces of pipe cleaner.
This technique can be used for all three mask examples.
An example of the metal nose piece is shown below…