This horse (in Houghton, Michigan, c. 1906) is sporting an old-fashioned contraption known as a fly net.

Similar fly nets were available in the 1897 Sears catalog, where the price varied according to the number of leather strips ($1.90 for a medium-weight, sixty-strip net; $2.15 for seventy-two strips, $2.40 for eighty-four strips, or $2.75 for a hundred).