Parshas Tzav: Rav Moshe Feinstein - How Do You Dress For Davening?
The Torah tells us that before taking the ashes outside the Machaneh, the Kohen would change his clothing (Tzav 6:4). Rashi says that he would take off the clothing he wore for the avodah in the Bais HaMikdash, in order not to sully them. "This is not a chiyuv," says Rashi, "it is a Din of Derech Eretz. The clothing that a servant wears while cooking should not be used when serving the king."
Rav Moshe Feinstein says that we learn from here that even Halachos Derech Eretz are real Halachos. An example is by davening where we need to wear respectable clothing. Rav Moshe says that if you do not change your clothing to something respectable when possible, it is as if "chas v'shalom" you don't know that you are standing before the King.
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