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" It is not surprising that what we wear in the Presence of the Blessed Sacrament is different from what we wear in our own homes or swimming. This is simply having proper decorum; the Church does not call man to wear a suit and tie to bed or constantly in his own home. Nor would it be sensible for him to swim in such an outfit.
Charity, decorum, and Christian decency demand that man appears well dressed for the occasion. The difference here is not simply “cultural” or “situational,” but a call to be charitable in our decorum, decency in our actions and dress, and humility as Catholics. Note how Police Officers are dressed while on duty, or Nuns in their habits and priests in their collar (and cassock, for Traditional priests). "
― , Catholic Modesty: What It Is, What It Isn't, and Why It's Still Important
10
" In the Catholic world, it is well established that modesty is more than just a hemline, but we cannot ignore the elephant in the room either. Few Catholics have yet to understand what it truly means to dress appropriately for Mass; many people dress as if they just came back from the beach or just rolled out of bed. Then we have the few, yet the loud, Catholics who seemed to have made it their life’s duty to remind others, regardless of time, place, or charity, that, according to them, their particular outfit is “of the devil.” While at the same time, many more Catholics, men and women, have come to believe that the amount of clothing that we wear doesn’t matter, as long as we have love in our hearts. But neither of these ideologies seem to coincide with Church Tradition. What we Catholics need to ask ourselves is,
“If how we dress, most especially in the Presence of the Blessed Sacrament, is as vitally important as the Church has always said until lately, how then is it suddenly not an issue? "
― , Catholic Modesty: What It Is, What It Isn't, and Why It's Still Important
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" Aside from the base Christian norm, which we must all follow, modesty, prudence, decency, and proper decorum can vary in our state in life. God calls all to work for the same goal: that of eternity, the salvation of their souls, and the souls entrusted to them. Those called to married life must be holy models for their children and helpmates to their spouse. Those called to the religious life are to be obedient to their superiors and God.
A married woman must practice a different form of modesty than a Nun, for example. A nun must obey the order’s rule, wear her habit, and obey her religious superior’s directions. "
― , Catholic Modesty: What It Is, What It Isn't, and Why It's Still Important