Strong’s Greek
G1193 — dermatinos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
δερμάτινος
dermatinos — pronounced der-mat'-ee-nos
from 1192; made of hide:--leathern, of a skin. see GREEK for 1192
2 occurrences in the KJV.
Matthew 3:4
And the same John had his raiment of camel’s hair, and a leathern girdle about his loins; and his meat was locusts and wild honey.
Mark 1:6
And John was clothed with camel’s hair, and with a girdle of a skin about his loins; and he did eat locusts and wild honey;