Prophet Muhammad, peace be upon him, said:
“I have been sent down by God to teach moral virtues and to evolve them to highest perfection.” (Authenticated by Al-Albani, 273)
Before accepting Islam, many new Muslims had a less modest lifestyle. After accepting Islam, attention must be given to adapting oneself to a more modest way of life. This includes not only the way one dresses, but the attitudes one holds and their actions.
Seeking popularity in school, or work, etc. should not be our goal in life, and it should be seeking the pleasure of God over all others. Once we focus our attention to achieving that, we can more easily adapt ourselves to becoming a more modest, humble Muslim.