Jamieson, Fausset and Brown on Matthew 3:4

4. And the same John had his raiment of camel's hair--woven of it.

and a leathern girdle about his loins--the prophetic dress of Elijah (2Ki 1:8; and see Zec 13:4).

and his meat was locusts--the great, well-known Eastern locust, a food of the poor (Le 11:22).

and wild honey--made by wild bees (1Sa 14:25, 26). This dress and diet, with the shrill cry in the wilderness, would recall the stern days of Elijah.