Just to be sure of the terminology - a true double-sided face is created from a single face in the object file? A double-sided mesh could be made up of double-sided faces, or pairs of single-sided faces, each pair having the same vertices but opposite winding order?

Thanks dadt - I'd searched the manual and could find nothing.

English Bob - "Horrible artifacts when rendering" doesn't sound nice. So now that I know how to enable double-sided polygons, here's a good reason to avoid doing it! Isn't there a note somewhere about only doing cloth simulations "with single-sided, uncapped objects" - I'm sure I read it recently, but I can find it again! (That's one of my big problems - I've read loads of stuff over the past few years, but don't know what's good and what's rubbish, and can't put my finger on where a particular nugget came from to double-check it!)

I read somewhere about "giving thickness" to items, as you suggest, if you wanted them double-sided. It said that the thickness should be added "in the direction of the normals" (or inverted normals, depending on whether you want your original surface to be the inside or outside) which makes good sense - so it's back to the modelling tool's manual for that.
I see your point about it not working in the cloth room, what with the item turning itself inside out as it slides down the figure.

Thanks again - all input greatly appreciated!

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).