empty suit means in slang: An elected politician seeking public office. He claims to have a particular set of beliefs but is in fact merely a pandering fool. (in Slang Dictionary, added by César Campos)
What else does empty suit mean?
People who are well-dressed but ineffective, especially when they work for higher-ranking male executives or corporate workers. (in Slang Dictionary, added by Georgia Escobar)
One who is proud of his accomplishments but has little impact on others’ lives. This insult is used to denigrate others who don’t merit the title. An empty suit is a suit that looks like a suit made of business clothes without any person. The empty suit is probably inefficient, or a fake, and about as useful or relevant as the clothes on a rack. An empty suit is a description that describes someone as a total waste of time. Editors love to refer to presidential candidates using the phrase “empty suit” in their editorials. According to many political critics, this or that politician “is just an empty suit” and therefore is not worthy of our attention. A few politicians are worthy of the title. An empty suit could be a senator who has a poor voting record or fails to attend sessions of the senate. This is because he’s not performing his job. Some politicians might advertise that they are “not an empty suit”, in order to differentiate themselves from others with empty suits. (in Slang Dictionary, added by Laylah Riley)