In Rabbinic literature, sivlonot refers to gifts the groom gave his wife-to-be. Among German Jews, from the 16th century on, sivlonot took the form of belts: the groom sent his bride a belt with a gold buckle; she sent him a belt with a silver buckle. The couple would then wear the belts under the huppah, sometimes attaching them by means of another belt or a chain. Sivlonot belts were often decorated with universal symbols of love, such as two intertwined hands holding a heart, or the portraits of a man and woman.
Shachar, Isaiah, Jewish Tradition in Art: The Feuchtwanger Collection of Judaica, The Israel Museum, Jerusalem, 1981