Polyester is pretty cheap and becomes popular among the poor, and among those so rich that they can accentuate it with obviously expensive things and not risk being mistaken for poor people. People of reasonable means and uncertain status mostly steer clear. Lights become increasingly popular, although a lot of people conservatively just put one light in one room of their house. Radios are distributed (less rapidly than paladins on flying creatures could ferry them around) and used to communicate between towns; this winds up serving partly as a replacement for their ineffectual postal system and partly as early storm warning. The theater person starts playing the first halves of recorded plays and songs over the radio; people who want to hear the rest have to attend a listen.