Could it be a pickup element? The LR Baggs element has kind of a fabric look to it.
https://images.reverb.com/image/upload/s--jHYYoedM--/a_exif,c_limit,e_unsharp_mask:80,f_auto,fl_progressive,g_south,h_620,q_90,w_620/v1485634234/bf3y2ay4lblhjmgvxaaf.jpg