Jamieson, Fausset and Brown on Isaiah 19:9

9. fine flax--Gesenius, for "fine," translates, "combed"; fine "linen" was worn by the rich only (Lu 16:19). Egypt was famous for it (Ex 9:31; 1Ki 10:28; Pr 7:16; Eze 27:7). The processes of its manufacture are represented on the Egyptian tombs. Israel learned the art in Egypt (Ex 26:36). The cloth now found on the mummies was linen, as is shown by the microscope. Wilkinson mentions linen from Egypt which has five hundred forty (or two hundred seventy double) threads in one inch in the warp; whereas some modern cambric has but a hundred sixty [Barnes].

networks--rather, white cloth (Es 1:6; 8:16).