For a number of years now some fringe groups have advocated the use of hemp, derived from fibers in marijuana plants, in clothing. Woody Harrelson, formerly of Cheers, has been a longtime supporter of this. And perhaps, in time, this will become a legitimate alternative use of marijuana.
However, apparently not all plants can be used as material for clothing. For example, Siegried & Roy's attempt to manufacture flashy suits from catnip has gone horribly wrong.