The patterns for these lovely curtains appear in a booklet of filet lace from the early twentieth century. In the index they are labelled as a store curtain and matching brise-bise curtains in the style of Louis XVI. They could have been used on the same window with the store curtain hung on the upper part and the brise-bise curtains hung against the lower panes or they could have been used separately. Brise-bise curtains are what we know as café curtains and only cover the lower half of a window.
The instructions for making the curtains, which are all in French, suggest that the lace should be worked in blocks of 1 centimetre. The dimensions given are 141 blocks for the store curtain and 85 x 55 for the smaller ones. I assume from looking at the pattern that the measurement given for the store curtain is the width. This booklet gives no instructions for working the filet lace but another volume I have, from the same time, shows how to make the background net and work the stitches so I think the expectation was that the lacemaker would know how to do both.