The purpose of this study is to examine transformable dress designs that can be converted into multiple design with the same basic pattern under the umbrella of sustainable fashion in terms of design, usability and marketability. For this purpose, the study was carried out in two stages. First, a capsule collection was prepared for young women working in the upper-middle sociocultural group, who will purchase the limited productions of national and international premium fashion brands focused on price / quality and care about sustainable fashion. In the study where the design process of the selected five dresses in this collection presented, the main idea is that each dress adapts to multiple sizes and, each dress forms can be created in different combinations from same garment pattern. Iterative design trials were carried out on the 38 size, ½ proportion and scale female miniature clothing form. How many different ways each dress can be used is calculated with the subset combination formula. In the second stage, prepared dresses; target consumer opinions about design-usability and marketability were obtained by sharing from one of the researchers' personal social media accounts. From the opinions and comments of target consumers; Although they do not decrease their shopping speeds, it is concluded that they like such designs, they are happy with their customisation, they can make emotional connection with dresses and find them marketable.As a result of the combination calculations of clothes and target consumer responses, it was pointed out that the concept of sustainability can be adapted to ready-to-wear production with transformable designs.