For test samples textile circuits with sewn and interwoven copper yarns and attached light emitted diodes (LED) have been prepared. Electrical properties of electronic elements have been tested by measuring intensity of LEDs emitted light before and after insulation as well as electrical resistance of 3 different conductive yarns. Geometrical (weight and thickness) and physical-mechanical (washability and resistance to wear) properties of samples have been measured as well. Given techniques can be applied to other parts of the electronic elements system insulation into smart clothing or smart textiles and could help develop and improve smart clothing technology in general.