mark 5:15 And they come to Jesus, and see him that was possessed with the devil, and had the legion, sitting, and clothed, and in his right mind: and they were afraid. - Free Bible Online

      15. And they come to Jesus--Matthew (Mt 8:34) says, "Behold, the whole city came out to meet Jesus."
      and see him that was possessed with the devil--the demonized person.
      and had the legion, sitting--"at the feet of Jesus," adds Luke (Lu 8:35); in contrast with his former wild and wandering habits.
      and clothed--As our Evangelist had not told us that he "ware no clothes," the meaning of this statement could only have been conjectured but for "the beloved physician" (Lu 8:27), who supplies the missing piece of information here. This is a striking case of what are called Undesigned Coincidences amongst the different Evangelists; one of them taking a thing for granted, as familiarly known at the time, but which we should never have known but for one or more of the others, and without the knowledge of which some of their statements would be unintelligible. The clothing which the poor man would feel the want of the moment his consciousness returned to him, was doubtless supplied to him by some of the Twelve.
      and in his right mind--but now, oh, in what a lofty sense! (Compare an analogous, though a different kind of case, Da 4:34-37).
      and they were afraid--Had this been awe only, it had been natural enough; but other feelings, alas! of a darker kind, soon showed themselves.

JFB.