SILKSKIN Original Silk Pillowcase
The answer: silk. More specifically, this bestselling SILKSKIN pillowcase, which manages to combine Hollywood glamour with practicality.
Whereas cotton (or even linen) saps the moisture from your face (and the expensive moisturiser from your epidermis), silk prevents your skin from drying out and forming creases. The story is that the pillowcases also have the same pH as skin, and allow it to breathe while you slumber. (The bonus: hair slides smoothly over the pillow so you don't wake up as a 'bed-head'.)
Which makes us feel we're in rather elegant company...
UK readers find SILKSKIN Original Silk Pillowcase/£39 at www.victoriahealth.com - click here (Do go via the Victoria Health page on our site, though - just click here - to enjoy an automatic 5% discount added at checkout)