And I will give [power] unto my two witnesses, and they shall prophesy a thousand two hundred [and] threescore days, clothed in sackcloth..................what is sack cloth? well the answer is probably going to be closer to a guess because nobody knows for sure what sack cloth actually is. so we will speculate here for the moment. the above verse states that the 2 witnesses testify while wearing such a cloth. 2 things come to mind here however, first when someone says sack cloth it conjures in the minds eye a garment which resembles a cloth bag which had holes cut in it for the head and arms. we see this type of garment being worn in MIDDLE EASTERN countries. and when in the ancient world a person is in mourning they discard normal clothing and assume the wearing of such a garment. we find this is so in the books of JOB and JONAH where it is said JOB  sat in ashes (normally setting in ashes was accompanied wearing a sack cloth) while the people of NINEVEH wore sackcloth and sat in ashes(JONAH 3:5). the wearing of such a garment spoke volumes in their days. it spoke that the person has given up all worldly pursuits and is in deep mourning. the second thing which comes to mind is that the sack in which the person wears be made of the coarsest type of fabric available. this was of course hemp cloth. which was in use in ancient times right up to the present day. today we call this cannabis which is the root word for canvas....

mid-14c., from Anglo-Fr. canevaz, from O.Fr. canevas, from V.L. *cannapaceus "made of hemp," from L. cannabis, from Gk.kannabis "hemp," a Scythian or Thracian word. Canvas-back as a type of N.Amer. duck is from 1785.....                                                                                                                                      .this canvas was in use during the ancient past and in the era where we used ships made of wood. all of the sails and rope employed on a ship was made from canvas. canvas the word comes from the word which designates cannabis and the word cannabis is the LATIN term for the herb we call nowadays marijuana!.........and when it says in the verse in REVELATIONS that the 2 witness testified wearing sackcloth it maybe true that what i am saying concerning the use of MARIJUANA is the correct definition. since marijuana has the ability to make the mental factor stable in spite of it being spun out of balance due to environmental toxins and evil influences etc.