I'm not really an expert on this "fabric" but I thought I would just jot down a few little techniques I used when making my skirt, in the hope that they will help others...
I've read that there is a teflon foot that one can use for working with leather and other "hide" like fabrics such as poly-urethane laminated cloth, PVC and other plastics; fabrics that have a "sticky" surface that adheres to the underside of the foot and so do not pass through the machine easily. However, I didn't want to buy a whole new foot just for the tiny amount of topstitching and stay-stitching needed for one, or even a few, garments; so I decided to try out my usual method for tricky fabrics... I cut tissue paper into strips and hold this in place under the foot of the machine as I am sewing, laying it in place as I go and feeding in new strips as needed.
This worked a treat!
I used a denim needle, and set the machine to a slightly longer than normal stitch (3mm) and after stitching I simply pulled the paper off of each side of my stitching. Easy, and free! since the tissue paper I use is... well, you know when you buy breakables and it gets wrapped up in a few sheets of thin tissue paper at the point of sale? Well I keep that paper just for this purpose; waste not want not, and all that.... and cut it into strips when I need it. Re-using and re-cycling!
Obviously, I didn't need to use the tissue paper when I was sewing seams, fabric right sides together, since the backing fabric had a regular fabric-y texture that passed through my sewing machine just fine; and I found I didn't need it for top-stitching the HongKong seaming down either. The tissue strips were only necessary for the very small amount of top-stitching and stay-stitching called for in my pattern, which is great since it can be a kinda fiddly technique. If one was top-stitching leather frequently then sure, it might well be worth investing in that teflon foot.
Incidentally, the tissue strip method is one I do use a lot of the time; any slippery and delicate fabrics such as silk and polyester chiffons, silk charmeuse, also with lightweight wool and rayon knits, and especially and always sewing delicates on the bias to avoid stretching; if I experience any difficulties I turn to the tissue paper treatment. Also, the few times I have cut up and re-fashoned RTW knitted jumpers and cardigans; the tissue paper strips work like a charm enabling me to sew these highly fray-able, and more bulkier knits on my regular machine as well. In fact all knits; from the very fragile to the very heavy hand-knits, will all go through one's machine with ease using this method.
But getting off track there; back to the PU...
My second tip is for the waistband; sewing the waistband facing down inside. My usual method using regular fabrics is to stitch a virtually invisible fell-stitch, picking up a scant one thread on one side then a scant one thread on the other, hiding the running thread under the fold of the waistband. In this fabric however, I worried that this would not be sturdy enough. Picking up just a scant fold of the PU, my thread ran the risk of not getting through to the backing fabric and just piercing the flimsy layer of laminate which could easily just tear away. I did not want topstitching visible on the outer view of the waistband, and hand-stitching big ugly visible sturdy stitches, even on the inside of a garment, was not an option (years of conditioning cannot be ignored here!)
So I turned in the seam allowance of the waistband facing, and machined a nice even line of topstitching along just inside the fold by a scant 2mm, keeping the interfaced outer waistband free. This provided a firm stitching line along which I could anchor the stitches, securing the waistband facing down to the waistband/skirt seams allowance. It also provides a focal point, a visual foil that draws attention away from those small hand stitches. See how those fell stitches are nearly invisible to the eye?
And no stitching visible on the outer waistband...
My last tip, a kinda obvious one hehe; I realised when I went to hang up my new skirt that the skirt hanger was going to leave permanent big ugly pinch marks on my beautiful pristine waistband. So I hand stitched (fyi; blanket stitches) on some ribbon hanging-loops to the sides ... I say no! to big ugly pinch marks!