A continuous ink jet printer including an ink tank for holding ink, an ink nozzle in fluid communication with the ink tank for ejecting ink droplets, and a gutter for receiving, through an ink-receiving inlet thereof, ink droplets which are not used for printing. This DFOS is based on the principles of Fabry-Perot and MichelsonMach-Zehnder. The lower garment includes a front panel with a movable front center panel and leg members, a rear panel with a movable rear center panel, leg fasteners for removably connecting the leg members, and panel fasteners for removably connecting rear panel and rear center panel. In one specific example, a signal line is connected from one electronic device to a second electronic device.