The Naked & Famous New Rainbow Core Selvedge Indigo - Weird Guy are made to make heads turn! The fabric starts looking like classic raw Japanese selvedge denim, but most rope-dyed denim starts with white cotton yarns. These yarns are reactive-dyed the colors of the rainbow before being rope-dyed in indigo vats. So, with wear, the indigo yarns will chip away to reveal rainbow colored cores.