The singer has been going down slow but realizes he's approaching the end. His clothes are the sole item of his estate with value, and he would like to make them available to his family, both for re-use and because they may have some sentimental value for them. They are not notably expensive to ship and he still has enough energy to take care of that before his demise. They are his final bequest to them. By saying "look for my clothes home" he's saying, "You should be expecting a delivery from me, and this is what it will be. And you may take receipt of the clothes as an indication that I have succumbed to my illness at last."