This paper presents an experimental study of the sewability properties of % 100 cotton fabrics. In this study, denim fabrics woven with three different weft densities and three different weft count. Two different finishing processes were applied to all fabric samples. Therefore 18 samples having different specifications were obtained. Sewing needle penetration forces were determined for these fabrics for sewability properties. Also bending rigidity and air permeability tests were determined for these fabrics for investigated the relationship between sewability properties. This study investigated the effects of weft density, weft count, finishing process, bending rigidity and air permeability on the sewability properties of denim fabrics.