Sew a wash bag

Well I now know why everyone says sewing with pvc is so difficult! I have had my eye on making a triangular bag for a while, after spotting a tutorial here.  Rather than cutting four rectangles as I would for my pencil cases and make up bags, I cut a shape more like a trapezoid. 

I would usually top stitch the outer fabric to the zip, but because the pvc sticks, I had to sew it the other way round! So, who has some tips for sewing with pvc? Leave them in my comments, as I still have a lot of this fabric left and I'm determined to use it!

Love Mrs Jones x