Composite nonwoven samples have been prepared from blends of fibers containing cotton and other fibers, such as bagasse, kenaf or ramie. The nonwoven structure has been stabilized with synthetic or bioderived polymers. Mechanical and thermal characteristics of nonwovens (tensile strength, modulus and thermal conductivity) were dependent both on the nature of fibers and polymer content, as well as on the nonwoven architecture reflected by the density of the final sample. Mechanical properties of nonwoven composites made of bagasse and poly(hydroxy butyrate) containing biobased plasticizers were also dependent on the length of fibers.