"In civvies" is a term used to describe someone who is not wearing their usual uniform or work attire. There are many synonyms for this phrase, including dressed casually, plainclothes, or civilian clothing. Other phrases that can be used to describe someone who is not wearing their uniform include off-duty, in mufti, or in plain clothes. These terms are especially relevant for military personnel and law enforcement officers who wear a specific uniform on duty. When they are not in uniform, they are said to be in civvies or dressed casually. Regardless of the term used, it is clear that when someone is in civilian clothing, they are not wearing their usual work attire.