Siman 386
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א אָבֵל חַיָּב בַּעֲטִיפַת הָרֹאשׁ, דְּהַיְנוּ שֶׁיְּכַסֶה רֹאשׁוֹ בְּטַלִית אוֹ בְּסוּדָר וְיַחֲזִיר קְצָתוֹ עַל פִּיו וְעַל רֹאשׁ הַחֹטֶם; וְהָנֵי מִלֵי שֶׁצָּרִיךְ עֲטִיפָה, בְּכָל הַיּוֹם. אֲבָל כְּשֶׁבָּאִין מְנַחֲמִים אֶצְלוֹ, מְגַלֶה רֹאשׁוֹ לִכְבוֹדָם. הַגָּה: וְיֵשׁ אוֹמְרִים שֶׁאֵין נוֹהֲגִין בִּמְדִינוֹת אֵלּוּ בַּעֲטִיפָה (הַגָּהוֹת מַיְמוֹנִי פ"ה); וְכֵן הַמִּנְהָג פָּשׁוּט, וְאֵין לְהַחְמִיר לְשַׁנּוֹת בַּמֶּה שֶׁלֹּא נָהֲגוּ אֲבוֹתֵינוּ.
1 A mourner is required to muffle the head, i.e., to cover his head with a mantle or a piece of cloth [so that] part of it enfolds his mouth and the tip of the nose. And this [matter, viz.,] that a mourner is required to muffle [his head] all day, applies [only when he is alone], but when comforters come to him, he uncovers his head out of respect to them. Rema: Some say that in these countries we do not adopt the practice of muffling the head. Thus is the common practice, and one should not adopt the stringent view to make changes regarding a matter which our fathers did not practice.