A lady approached me at church last night. She is trying to remake a dress for her daughter, wanting to add a little to the length.

The fabric is a very slick polyester type. When she sews it loops on the bottom of the fabric.

I suggested:
1- Since the fabric is slick, maybe add some interfacing to help the machine grab hold.

2- Check the tension. She said that she has a machine that AUTO is the tension control, and so doesn't mess with that.

Any ideas? Thanks.