Stitch reinforcements have an increasing role in the design and customization of fiber reinforced polymers. Commonly known for their uses in non-crimp, stitch bonded, and 3-D textiles, innovations have expanded the role of stitches for optimization of forming behavior, improving bonding in composites, and customized textile sensors. Recently, the novel implementation of embroidery stitching for manufacturing Kirigami-based deployable structures has inspired new needs for the fundamental understanding of the effect of stitching on the resulting mechanical behavior. Embroidery stitch machines create a lockstitch: a stitch consisting of upper and lower threads intertwined to “lock” together. Despite the advancements in their manufacturing technology, stitches are under investigated in their own ability to augment composite textile behavior through design and material hybridization. While efforts have been made to model warp stitching and through thickness stitching of 3-D textiles, very little has been researched into the mechanical effect of stitch pattern, processing, material, and methods to characterize stitch behavior, both experimentally and through multiscale models. In this work, a framework is developed for the geometric modeling of lockstitch architectures and the integration of these stitches with reinforcement material. Homogenization of numerical results will be used to compare with experimental tensile results to evaluate the influence of stitch pattern and placement on the CFRP so that a fundamental understanding of embroidery stitch influenced mechanics can be established. Through these initial mechanical characterizations, it is anticipated that improved topology design and stitch pattern optimization can occur for embroidery stitch-based modification of composite reinforcements.