Abstract: The buckling of a fabric sheet subjected to a uniaxial tension in a direction making arbitrary angle, θ(0°<θ<90°) say, with respect to that of warp is investigated. The equation to determine the buckling direction angle, β say, was obtained and, as illustration, the solution curves of the equation for θ=45° and θ=30° were plotted. It is shown that when the fabric sheet is subjected to tension in non-warp/non-weft direction the out-of-plane buckling of fabric is possible, two buckling modes (flexural and extensional modes) and the both corresponding buckling conditions are obtained. The results given by ZHANG and FU (2001) are the special cases of this paper.