The disclosure relates to a system for measuring physiological data and/or motion data of a user. The system comprises a garment (10) having an outer face (10a), an inner face (10b), a first electrode (12) configured to contact the skin (18) of the user at a first position (12a) and a second electrode (13) configured to contact the skin (18) of the user at a second position (13a). The system further comprises a first electrode lead (14) configured to electrically connect the first electrode (12) to a first interface contact area (15), a second electrode lead (16) configured to electrically connect the second electrode (13) to a second interface contact area (17), a first interface unit (20) arranged on the inner face (10b) of the garment (10), a second interface unit (21) arranged on the outer face (10a) of the garment (10) and an electronic device (22) configured to receive measured physiological data via the second interface unit (21). The first interface unit (20) and the second interface unit (21) are connected to each other by means of a first fastening mechanism (30). The electronic device (22) is attachable to the second user interface unit (21) by means of a second fastening mechanism (31, 50). The second fastening mechanism is detachable. The second interface unit (21) is adapted to provide an electrical coupling between the first interface contact area (15) and the electronic device (22) and between the second interface contact area (17) and the electronic device (22).Linvention concerne un système de mesure de données physiologiques et/ou de données de mouvement dun utilisateur. Le système comprend un vêtement (10) comportant une face extérieure (10a), une face intérieure (10b), une première électrode (12) conçue pour entrer en contact avec la peau (18) de lutilisateur au niveau dune première position (12a) et une seconde électrode (13) conçue pour entrer en contact avec la peau (18) de lutilisateur au niveau dune seconde position (13a). Le système compre
