Not too happy with you using autism to call someone dumb, but I'll leave this up assuming it was just a one-off.
Definition of sash for Students. 1  1 : a frame for a pane of glass in a door or window. 2  2 : the movable part of a window.
Sashes are indicative of holding the class of Grand Cross or Grand Cordon in an Order of Chivalry or Order of Merit. The sash is usually worn from the right shoulder to the left hip. A few orders do the contrary, according to their traditional statute.