I prefer some high-tech moisture-wicking materials available these days. er, nylon is not the best choice. tried that once, got a rash.
the weather you will be riding in will sort of dictate what you should wear. my friends and I do layering, and as the temps change, add or remove a layer or two for your comfort. in this layer kit, compact rainsuits and electric heated vests/chaps/gloves are available, and for really chilly riding, you can even get heated handgrips! but naked under leather, or even going commando, can lead to chafing.
ps- if you are just wearing it as fashion, or for sex, well, wear whatever you want and are comfortable with, and that suits your occasion.