Cossie is a colloquial term that is used in some parts of the world, particularly in Australia and New Zealand, to refer to a swimming costume or a bathing suit. There are several synonyms for this word, including togs, swimmers, swimsuit, bathing suit, and swimwear. Each of these terms can be used interchangeably to refer to the same clothing item. In some cases, the term cossie may even be used as a generic name for all swimwear, while in other cases, it may refer to a particular style or design of swimwear. Regardless of the context, all of these terms are easily understandable and widely used across the English language-speaking world.