Natural fibres break off more easily than synthetic fibres, so the synthetics show more pilling even though all fabrics do it.
Interesting. I mean, I know my old, (old) Patagonia fleece jacket pilled like crazy. I notice that the newer fleece isn't nearly as bad as the old stuff. Hmmm. maybe I'll need one 'o them depilling razors.

maybe I need a WOOL kilt! BTW, Rigged, we gotta get together, maybe do a kilt night in Mountain View at that Pub on Castro Street.

Thanks for the link to the archived post, Raphael.