The phrase "in mufti" is commonly used to refer to a person who is not dressed in their usual military or formal attire. Some synonyms for this phrase include "in civilian clothes," "in plain clothes," "in regular clothes," and "in regular attire." These synonyms are often used in place of "in mufti" in different contexts, such as in law enforcement or military operations. Using these synonyms can help avoid confusion or misunderstanding when describing a person's appearance and help convey the appropriate level of formality for the situation.