The rarest and finest fabric to have custom suits created with is vicuna. This precious fabric can only be found in the mountains of South America. An endangered species the Vicunas are protected by almost every wildlife agency and in-fact shearing them helps to conserve the species as this helps to prevent poaching. Vicunas coats are softer than cashmere and perform under the coldest of temperatures. Once it is milled only the finest custom suit makers carry this fabric. Prices reach upwards of $15,000 and is truly for the super elite. Vicuna suits can often be found on the backs of superstars and captains of industry.