- On a simple level, Ibn Ezra tells us that this lowly dress would shame the monarchy.
- According to the Me’am Loez, people were not allowed to wear sackcloth before the king because it was considered a bad omen as such people would thereby be walking reminders of death. For this reason, we find in the Torah (Bireishis 50:4) that when Yaakov passed away, Yosef was not allowed to have an audience with Pharoah.
- Also, the Talmud (Brachos 62b) learns a kol v’chomer (a fortiori) argument that if in our verse, a person could not wear sackcloth (which, although is ugly, it is not repulsive) before a human king, how much more-so should one be forbidden from spitting (which is physically repulsive) in a synagogue, where one stands before the King of kings.
- The Kabbalas Rabbah takes this idea one step further. If it is inappropriate to walk in front of a hum king looking like a mourner, how much more-so is it inappropriate to appear before the King of kings looking that way. In other words, in general, having a downcast negative attitude does not befit the servant of H-Shem. Even on the night of Rosh HaShanah, when we are judged, we are instructed to leave the synagogue confident in our positive judgment.