Carlo Simi was the costume designer, but Clint’s look is not attributed to anyone in particular. Eastwood reported that he had bought his costume from a Santa Monica wardrobe store, borrowed the leather gun belt, pistol and suede boots from Rawhide, the tv series he played in the 1960s, before starring in A Fistful of Dollars. - Classiq
Eastwood wears the same cowboy boots that he wore as Rowdy Yates on Rawhide, though the color cinematography of Leone’s “Dollars trilogy” allowed viewers to see the rich medium tan color of the roughout cowhide for the first time. These square-toed boots have slanted heels approximately 1¼” or 1½” high. - BAMF style