The primary aim of image-based virtual try-on is to seamlessly deform the target garment image to align with the human body. Due to the inherent non-rigid nature of garments, current methods prioritize flexible deformation through appearance flow with high degrees of freedom. However, existing appearance flow estimation methods focus solely on the correlation of local feature information. While this strategy successfully avoids the extensive computational effort associated with directly computing the global information correlation of feature maps, it leads to challenges in garments adapting to large deformation scenarios. To address these limitations, we propose the GIC-Flow framework, which obtains appearance flow by calculating the global information correlation while reducing computational regression. Specifically, our proposed Global Streak Information Matching Module is designed to decompose the appearance flow into horizontal and vertical vectors, effectively propagating global information in both directions. This innovative approach significantly diminishes 1 computational requirements, contributing to an enhanced and efficient process. Additionally, to ensure the accurate deformation of local texture in garments, we propose the Global Aggregate Information Matching Module to aggregate information from nearest neighbors before computing the global correlation, and to enhance weak semantic information. Comprehensive experiments conducted with our method on the VITON and VITON-HD datasets demonstrate GIC-Flow outperforms existing state-of-the-art algorithms, particularly in cases involving complex clothing deformation.