|Marking the matching notches for pants that need edge finish (e.g., overlock or serging the edge) before sewing the seams. My "disappearing pen" ink didn't disappear on the test scrap, so I was in a bind.
I tried using some blue painter's tape and cut triangles from the edges, then placed the triangles inside the seam allowance, so that my serger wouldn't cut them off before I needed to see where they lined up. I placed the '"point" of each triangle to correspond with the point of the notch.
The tape remained in place during the overlock step. Joining the front and back seams was easy, and the tape pulled right off, and did not leave any marks or color.