Ashes to Ashes, Here is an article about the T-Shirt Experiment, although, not told by Profesor Winston.

Thank you thank you thank you! lol. I was going insane trying to find it!

more facts, the sterilized T-shirts were kept in sealed plastic bags in the fridge, the participants were not allowed to use soaps,deoderants ect, after worn for the night, put straight back into bag sealed and put back in fridge,each time this happened for the duration of the trial.