"Lambskin leather" refers to a type of leather material made from the skin of young sheep, called lambs. It is soft, smooth, and known for its fine quality. Full definition
They also feature a black lambskin leather belt loop, a coin pocket with turn back finishing, a single button closure, a zip fly, matte black hardware, tack buttons, and light stacking at the hem. (qunel.com)
Very soft lambskin leather with intentional wrinkled / distressed look. (1stdibs.com)
Black lambskin leather jacket with wool sleeves designed by Nicolas Ghesquiere for Balenciaga fall 1999. (1stdibs.com)