See questions above. I have often wondered when being in a similar situation of having to enter or exit a home or hall and women are present at the entrance, if I’m holding on to my coat that can be placed over my hand bellow the elbow, and it being four Tefachim wide (about 40 cm.) and ten tefachim long (about 1 m.), would that be considered as a Mechitza or separation, permitting me to walk between the women?

Although those measurements are what a temporary Mechitza requires for this purpose, a Mechitza should be stationary and not in the move.