eglantine, yes, I'd come across that information about fleece garments recently. It is a bit depressing, isn't it? I don't have much in the way of fleece garments because I've never found them as warm or as breathable as natural fibres.
One thing that buoys me up in all this depressing news is that plastic is made from oil and oil is organic so I think that in the geologically long term Nature will deal with it. Bacteria have already been found that eat and digest plastic and, presumably, turn it into organic shit. The cycle of animal life is amazing.