The Robe of the First Tobaccomancer

Several years ago I had an interesting opportunity. My mother was an anthropologist before meeting my father. Her area of study was in religious practices, more exactly, the occult. She had written her thesis on witchcraft in America. In the Mission belt of California there exists a branch of witchcraft merging some of the religious beliefs of the predecessors of the Mayans and a kin of what we think of when we hear the term witch. My mother was asked to consult on some of their findings. I had the privilege to go with her to see some of these artifacts and hear of this interesting little known occult sect. A large focus of this sect was their belief in the mystical powers of tobacco, not unique as tobacco has been in use as a tool of many many religions over time.
Most of these findings and artifacts were the norm. Stone carvings, pipes, various artifacts from graves etc. But there was one interesting artifact they did not have that came up again and again. The robe of the first tabaccomancer. There is a rumor that we be of the missionary groups took this garment back to Vatican City. Allegedly this robe would conform to its owner into whatever garment made them most comfortable while smoking.
How would the rob conform to you? Would it appear as a comfortable smoking jacket? Your grandfathers coveralls? Perhaps just a beloved shirt with a front pocket?