Proper dressing is a matter of Sila, an expression of Right Resolve, non-harming, withdraw from inmodesty, conflict-lessness.
One proper dressed, meaning mainly ckean clothes, modest color, not occupying, not "screemin", covering the body, having no holes, demonstrates not only respect but also that he/she has vitures, at least sacrificing time for not-harming, either lifting him/herself nor impress with demonstrative modesty. Like in comparing the different kinds of ascetics, wearing rag clothes, only one set. The first is simply to unskilled to hold and wear proper clothes, the second does it for the sake of gain, the third follow modest modes because praised by the Buddha, the fourth because he does not need more, is content.
Where impressive clothes likes to promote oneself, display worth. Dressed without cover the body, even very shameful parts, put oneself on the marked of fools after low pleasure of sense, provokes to get eaten thinking he/she can gain in advanced, not knowing that there are those out who wouldn't pay even later.
When many different social classes come together, work together, the use of uniforms, similar way of dress in proper way is useful for avoiding not only conflicts but, since no interesting left and right, let focus on the undertakings task, such as schools or if lay people meet in monasteries, making retreats, not to speak of the monks. The impression of unity is also given, yet to equal increases the pride of "we", "equal am I".
Somebody encouraging others to waer proper clothes, keep them clean, teaches how to wear, helps in maintaining... gives clothes where needed, discourages to shamelessness in regard of dress, explains the benefits and disadvantages... a giver of beauty, esteem, honor... such a person can expect to increase his own beauty, esteem, status, vanna.
One should stick by people who encourage to good and one opposing good for what ever pride, greed, out of feeling oppressed, a person advocating not so good for foolish liberal purpose, encourages to shameless appearing and recklessly, not only that he can expect uglyness and lose of honor but hardly ever can gain even an even non-beauty human existance.
So please consider things wise and stick by approving of good, harmless and moral shame protecting and do not go after short pleasures, honor under many but not the good and wise, after politic seeking votes from fools and strong attached.