sash (n.1) Look up sash at Dictionary.com
"strip of cloth," 1590s, "strip of cloth twisted into a turban," from Arabic shash "muslin cloth." Meaning "strip of cloth worn about the waist or over the shoulder" first recorded 1680s.
sash (n.2) Look up sash at Dictionary.com
"window frame," 1680s, sashes, from French châssis "frame" of a window or door (see chassis). French word taken as a plural and -s trimmed off by 1704.