In their streets they shall gird themselves with sackcloth: on the tops of their houses, and in their streets, every one shall howl, weeping abundantly. With sackcloth - שק sak. The word is in the plural שקים sakkim, sacks, in one of De Rossi's MSS.
Related Commentaries of Isaiah 15:3
Isaiah 15:3
3 In their streets they shall gird themselves with sackcloth: on the tops of their houses, and in their streets, every one shall howl, weepinga abundantly.