Mohair is the long silky hair of the Angora goat.  It is a strong and durable fiber that takes brilliant color dyes well.  And it makes wonderfully warm and fuzzy sweaters, as seen in these examples from 1963.

Snow white pullover with V-neckline and cable stitching at the center front.  Hand knit in Italy by Blairmoor Knitwear.  Sold in 1963 for $18 (about $125 in today's dollar).

A turquoise cardigan banded in brown and honey beige, hand knit in Italy by Famelia.  Sold in 1963 for $18 (about $125 in today's dollar).

Beige vest edged in white by Darlene Knitwear.  Worn with a white blouse and white pants.  Sold in 1963 for $11 (about $77 in today's dollar).

3 piece pink suit consisting of a sleeveless shell, a cardigan, and a pencil skirt, all by 
Jane Irwill.  Sold in 1963 for $36 (about $251 in today's dollar).

And my favorite, a brown bateau necked sweater with black and white animal spots.  The 3/4 sleeves are bell shaped.  Hand knit in Italy by Famelia.  Sold in 1963 for $25 (about $174 in today's dollar).