Materials comparison chart

[Moosedog]

Yes, the poly seems to help. Also stitching with poly thread helps. I have a hard time comparing, though, as all the poly-cotton kilts I have made or bought have the pleats edge-stitched. If they haven't, I have added that immediately to help hold in the pleats.

Moosedog

[The Wizard of BC]

While it is true that the Polyester content of the Poly/Cottons blends will effect its ability to hold a pleat please remember the chart talks about pleat holding not wrinkle resistance. Think of Dockers trousers. The fabric will remain fairly wrinkle free but the crease in the leg will fall out over time. This is what the chart refers to.
If your temp. is exactly right when you press or iron you can set a crease but you are dangerously close to the melting point of the fabric. This is why most of us who use Poly/Cottons for kilts edge stitch the pleat creases. This way you can enjoy the wrinkle resistance and not have to re-baste and press the pleat creases over and over.

I also agree that the chart should list Poly/Cottons a fair not poor at holding a crease but with such great variability in fabrics many are defiantly in the poor range.