I had long wanted to try this so when I saw it as an activity on Meet-up.com I was all in. I met a group of 16 others in Asakusa and the organiser took us along many back streets until we arrived at Wanariya - which I have since found has a really good english website. It was a bit like the 'paint your own pottery' places I've been to in London where you choose an item, decorate it and then they bake it for you. Here we could choose from t-shirts, bags or simple cloths and there were lots of examples around to inspire you.
I chose a rectangular cloth. We had a little lecture in english and japanese to start all about the history of indigo and its manufacture and then we were off. The teacher was suitably dressed with encouragingly blue tinted hands.
The eagle eyed among you will have noticed the looms in the background of the teacher photo.