Ayin hara refers to publicly flaunted wealth (see Bava Basra 2b), explicit national census, and even a public Divine revelation. The evil eye caused the loss of wealth, a national plague, and the breaking of the luchos, respectively. The second luchos, which were given privately, lasted, proving that nothing is better than tsnius (Rashi, Shemos 34:3).
Of course, the opposite of these traits are tsnius and chessed, respectively, factors in the test of Rivka that continue to be critical in choosing a wife today. And while the specifics of tsnius are undoubtedly affected, within certain bounds, by time and place (see Rambam Hil. Ishus 13:11 and Minchas Shlomo 91, 23), the concept, as well as its particular application to women (see Rashi Braishis 1:28 and 18:9), is as timeless and universal as the Torah itself.
(Rav Mordechai Willig)