Batman's cloak is a vital part of the superhero's appearance, as it adds an air of mystery and menace to his already formidable persona. While "cloak" is the most commonly used term for this iconic garment, there are a number of synonyms that might be used to describe it. For example, one might refer to it as a cape, which suggests a more regal or heroic aspect to the garment. Alternatively, one could use the term mantle, which evokes a sense of weight and authority. Other options might include shroud, veil, or even simply a robe, depending on the context and the tone that the writer is trying to convey.