Tensile behaviors of 1D (unidirectional), 2D (plain woven), and 3D (braided) C/SiC composites were compared. The results show that 1D C/SiC minicomposites have the highest tensile performance compared to the lowest of 2D C/SiC among the three composites studied. The characteristic slope recovery exhibited in stress–strain curves of 1D composites is absent in those of 2D and 3D composites, which can be attributed to different preform architectures and constituent properties. A straightforward approach was developed to model the tensile properties of the multidimensional composites based on properties of minicomposites. Such relationships are fairly robust for these real composites when orthogonally loaded.