ISWC is the premier forum for wearable comouting and issues related to on-body and worn mobile techologies. [...] ISWC'09 in particular attempted to broaden its scope to cooperative wearable systems. This volume contains the selection of late breaking results, video papers, demonstrations and contributions to the design contest as chosen by the programme-cochairs with the support of international reviewers. The contributions are a valuable resource for students and researchers who want to have a look into the most recent state of the art in wearable computing. [...]