Benefits of breast-feeding are so well known that mothers want to breast-feed their children. However there are a few difficulties to breast-feed when they are out for the purpose of work, visit and other social activities. The exposure of the breast is one of them. With the results of 2 surveys, 6 designs were developed. The extinguishing design features were breast openings, which were developed using various fastenings such as elastic tape, buckle, zipper, velcro, snap and button. Three outer wear designs of selected breast openings were developed. These three researched designs were made of proper materials. The purpose of this study is to develop outer wears of functionality and good design for breast-feeding mothers.