This document summarizes a study to develop and test a support bra for breast immobilization during breast radiation therapy. The study aims to create a bra that is technically acceptable to healthcare professionals and aesthetically acceptable to patients. The study involves stakeholder workshops, product design refinement, testing on phantoms and healthy volunteers, and a clinical feasibility trial. User workshops identified key patient concerns like modesty, discomfort, and a lack of information. Technical challenges include reproducing positioning and accommodating different breast sizes. The goal is to improve patient experience and precision of radiation therapy through a customized support bra.