The simple requirement that everyone must dress modestly.
The objective of mandated modesty is to assimilate the culture with traditionalist
ideals. The way the masses dress can often be reflective of the state of the culture... in today's age, the typical American will wear sweatpants, graphic t-shirts, 3XL shirts, revealing clothing, awful looking shoes, and so on... These examples serve as a representation of a society that is lazy, depressed, overweight, promiscuous, obsessed with consuming, and ultimately without a purpose- the antithesis of
excellence.
This idea is similar to the "broken window theory" regarding that the appearance of the surrounding environments can influence the behaviors of those within that
environment. In essence, people will act in accordance with the beauty -or lack of- in their
environment.
The low-IQ explanation: Requiring people to "fake it until they become it" to improve the culture.