Used mainly in business accounting and implies sharing information openly. It is similar to “open the books” or the HR term “open door policy”. When a potential buyer is interested in acquiring a company or a particular project, to ‘open the kimono’ implies revealing financial and other vital information about the company and being open and transparent in discussion. The kimono is a Japanese traditional garment worn by women, men and children and the expression propagated during the flourishing trade between U.S. and Japan.