The fashion system has increasingly been imbued by ecology and sustainability. While in the recent years a lot on approaches to more sustainable consumption behaviour from the con- sumers’ side have been suggested, this study focuses on the very practice of how sustainabil- ity - in an applied matter - is realised within a fashion company. In this dissertation, two Swe- dish fashion brands, Nudie Jeans co and Filippa K, are being investigated and analysed due to their brand philosophies and concepts dealing with sustainability. If Nudie Jeans co’s first all- organic denim collection launched in Autumn 2012 or Filippa K’s emphasis to the longevity of clothing by classic shapes and plain colours; both ideas foster a slow fashion movement. One of this thesis’ implications is the fact, that the term sustainability is much more far- reaching and expansive as commonly defined. Also timelessness and tradition could be sus- tainable, if still taking care of environment and society. Finally, concepts of sustainability which are commonly not highlighted shall be identified and fill the yet existing gap.