The egg white fabric of the Dong Minority exemplifies their wisdom and represents rich regional features. It is renowned for its superior properties, especially its fabulous luster and excellent handle. However, the production method is rarely documented and instead has been handed down mostly by oral communication, and thus it is shrouded in mystery. In addition, due to low economic efficiency, a secret prescription and the challenges brought about by modern technology, this unique ethnic costume is threatened by extinction. Should this traditional handicraft be preserved or sacrificed? In this study, the secret of egg white fabric is solved by investigating its fabrication and properties. It is obvious that making egg white fabric involves complicated handiwork and numerous processes, including dyeing, fixation, brightening and starching; nevertheless, it has good physical properties. The experimental results indicated that egg white fabric has excellent texture, good thermal insulation, abrasion property and color fastness to laundering. Hence, this provides valuable inspiration for designers and manufacturers to produce unique and sustainable products.