They only use industrial sewing machines on Project Runway...Most of the time is someone is referring to a merrow stitch...it is a serger stitch.
Industrial machines usually only do 1 stitch...straight. So in order to finish the edges you need to go to a different machine and serger the edges.
I enjoy watching to see who is having terrible trouble with the machines on the show....usually those are the people that are gone pretty quick...