Thirteen small fabric fragments have been analyzed, which represent two types of fabric structure: 2x1 half basket weave and 1x1 plain weave. The half basket weave is the most common fabrication structure used for heavier sails. The baste fiber fabric can provide a wealth of information with regard to type of sail and possibly country of origin base on their fabric structure, e.g. weave structure and fabric count, as well as seam types.