Phil,
I agree with Overseer. I've seen, on buildings with a distinctive bond, that the bricklayers will adjust the bond between windows, etc., so that the bond finishes properly at the edges of the openings. So you would find that your Flemish bond might have an extra header or stretcher somewhere between the openings. My son-in-law, a very experienced brick layer, says that a large part of the art of good bricklaying is laying out how walls will actually be built with the bond in use so that corners and edges can be handled properly with the minimum of special bricks.
Jim.