means A band of fabric worn across the body or around the waist, often as a decorative or ceremonial mark of rank, honor, or occasion; also the framed part of a window that holds the glass.

from The fabric 'sash' comes from Arabic 'shash,' meaning muslin or a length of fine cloth, which once also named the turban wound from such cloth. English speakers in the 17th century borrowed it and reshaped the spelling to 'sash.' The window 'sash' is a different beast entirely — likely an English mangling of the French 'chassis' (frame), heard as a plural 'sashes' and then back-formed into a singular 'sash.'