Coloured Denim- What's That All About?

Over the weekend I have been continuing my quest to replace all the heaps of clothes I threw out of the wardrobes and sold on EBay with new ones, mostly from EBay too.

It was the turn of that staple of everyone's wardrobe, jeans, as I have but two pairs I wear all the time, one pair of skinny jeans which, due to their lack of Lycra or stretch are very hard to get on or off, so which I wear on nights out only, and a pair of very old black stretchy boot cut jeans which I re-dyed as they were going charcoal, but which are fraying.