I've examined, worn or been issued a whole bunch of duty gear between the Bicentennial and this spring.
Nylon is a lighter, low maintenance alternative to leather and it's fine for hard-use belts, pouches and keepers. Safariland's hard-shell holsters are about as good as it gets in that class of equipment.
The worst shixt I ever saw issued was Clarino.
There is still nothing more comfortable than the old billeted style belts depicted in the first post of this thread.