definition of lambrequin

my note: a lambrequin is an important design for the upper part of the window ; the question is whether it highlights the actual window area ; does it give support to the functions of light and 'the outside view' that are important for windows; does a lambrequin delineate the window too much- the lambrequin then delineates the window but what about the whole window area. IS a lambrequin suitable for wide windows..or recessed windows...or high windows- from floor to ceiling...

another definition and note that a lambrequin also refers to a covering over a helmet worn in medieval times by knights