When you go to BR and get a fantastic pair of work-worthy trouser jeans, essentially for free, don't put them in the wash without checking the tag. Lord. These things are basically viscose, held together with a whisp of elastane. Um, before I trashed them with water and heat, they felt magically like 100% cotton twill?!?! And now they are 3 inches too short, a size too small and ready for the bin, dammit.
Did I mention that there are no more to be had?