The term 'SARONG's Lack' is a crossword solution that can be filled in with the word 'SEAM, ' which is a four-letter word. A SEAM is a line of stitching that joins two pieces of fabric together. In the case of a SARONG, it is a garment that is traditionally worn by people in Southeast Asia and is usually made from a single piece of cloth that is wrapped around the body. Therefore, the lack of a SEAM in a SARONG is what makes it unique.