Here's a sewing tip: Use Lemon Pledge and polish the bed of your sewing machine. Also take off the foot and polish the bottom of it. I did that and have had significantly less trouble with fabric getting out of alignment from the top or bottom layer stretching when I'm sewing a long seam. Was sewing some 2.2 PU coated ripstop today and it wasn't a struggle at all (the coated side is rather grippy).
My poor kitties were the inspiration for this. We noticed every time we Pledged a surface that they were used to jumping on, they'd hop up then slide like it was an ice skating rink
, usually right off the other edge. I finally put 2 and 2 together.