The Gemorah in Shabbos 62b says that a reason for the destruction of the Beis Hamikdash was women used excessive cosmetics, and that a women should care about her appearance for the purposes of not being repulsive to her husband.
In the Shevet HaLevi there is a responsa about a woman who dressed herself nicely and put on makeup only when she was going out of the house, where she would be seen by her friends and neighbors. This is when she cared to appear attractive. However, in her own house, she did not care to enhance her natural appearance. Was this conduct acceptable, or did it indicate some degree of a breach in the standards of tznius? The answer given was that although we find in the Gemarah that Chazal emphasized that a woman should care about her appearance, this is specifically in terms of not being repulsive in front of her husband. If a woman puts a great effort into being noticed by strangers, this is reminiscent of the sins of the daughters of Yerushalayim at the time of the destruction.
So to stress the point: The Beis Hamikdash was destroyed due to over-usage of cosmetics.