In short, no. Kelsier did not create mourning bands. However, he was instrumental in helping to popularize them and make them fashionable among the nobility of the Final Empire. Before his death, Kelsier was a skilled jeweler and metalsmith, and he used his talents to create beautiful pieces of jewelry that were both stylish and unique. Many of these pieces, including the mourning bands, were given away to friends and family as gifts. It is believed that Kelsier's wife, Mareena, was the one who actually created the first mourning band after her husband's death.