Dynamic behavior and fit of Karate uniform “Karate-Gi”: Preliminary investigation through 4D body scanning technology

Abstract

This study investigates the dynamic behavior, fit, and interaction of Karate-Gi with the Karateka’s body using 4D body scanning technology, aiming to develop a Karate-Gi that accommodates the Karateka’s dynamic anthropometry in various situations. For this purpose, 4D body scanner “MOVE4D” was used to capture a Karateka test person both in static poses and while performing basic karate techniques with different ranges of movements. The scans were conducted in three situations: minimally clothed, partially clothed, and fully clothed. Raw scans were processed to extract key data, including 3D homologous meshes, along with both static and dynamic body measurements. These outcomes were useful in highlighting the relationship between the Karateka’s body anthropometry and the behavior and fit of their Karate-Gi, both in static poses and, more importantly, during motion. Results indicate that the behavior and fit of Karate-Gi change significantly during motion, with deviations most pronounced in peak postures and specific body regions where mobility and comfort may be restricted. These variations are strongly influenced by the range of movement required for different stances and techniques. Furthermore, findings confirm that in addition to dynamic linear body measurements, Karateka’s full 3D shape across their full range of movements must be considered. These insights will aid Karate-Gi designers and manufacturers in developing a motion-responsive sizing system and optimized fabric features, ensuring enhanced ergonomic comfort for Karatekas in all situations.