Thank you for the grease ideas. I have considered a small sachet of food materials to hang around my neck - rancid salt pork and salt beef and fish - but I have resisted storing the more putrid ingredients, or those that have the potential to be putrid over time, with the clothes. I actually washed them a few months ago, because I decided to see if I could replicate the odors I want with clean clothes. So far it seems to be a success.
I tried stagnant water once before - I actually went for swim in my shirt and slop house, lightly salted my clothes, and then wrapped them up tightly in a plastic bag. After a week I opened the bag, and my senses so grossly assaulted I left them in the garden to be rained clean. It turns out that the body of water I went swimming in was once the outlet for a gelatin factory, and there was an unusually high level of animal nutrients in the water and a corresponding spike in microorganisms. And could that sentence sound any snottier?
Wet wood is a real idea, though. The wood chips themselves have very little smell of their own. I could just wet them and use them to line the base of the scent chamber.