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It is proper from one to wear a hat and jacket for the recital of Birchas Hamazon[1], and the same applies regarding Meiyn Gimel.[2] There is no need however to do so for the after blessing of Borei Nefashos.
[1] See Admur 183:6; Kitzur SHU”A 51:10; M”B 183:11; Piskeiy Teshuvos 183:7[2] Piskeiy Teshuvos 208:17

