The research is dedicated to the integration into the jacket of an electrodynamic human motion energy harvester with planar structure. Electrodynamic converter consists of flat, spiral-shaped coils and a rectangular magnet and all elements are deployed on a variety of clothing items. During the human motions the generator elements move one relative to another and induce the pulses of voltage. By optimization of coil and magnet dimensions the mean power of into the jacket integrated prototype about 0,2 mW is obtained. With the planar coil geometry the generator's minimal volume and occupied space are achieved, therefore power density of generator (about 1,8 mW/cm3) is higher than proposed by other researchers and it is suitable to be fully integrated into clothing. The generated energy can be used for running of different integrated sensors and/or stored for later usage.