The objective of this research work is to investigate the possibilities of 4D body scanning technology to analyze both the karate practitioners (Karateka) body shape and measurements during specific movements as well as the dynamic behavior and fit of their uniforms (Karate-Gi). That's in the aim to design more suitable/comfortable Karate-Gi for various cases and situations, meeting karateka's specific needs and requirements and improving their performance. We present in this paper the scanning process and protocol, the generated and exported data as well as some first results and conclusions. Indeed, we started by using the 4D scanner "MOVE4D by IBV" to capture a karateka test person both in static poses as well as while performing a simple/short karate basic technique, in three situations: Minimally Clothed; Partially Clothed and Fully Clothed. Then, we processed raw scans to export various data from MOVE4D's processing software such as the karateka 3D homologous meshes, the rigged animated 3D karateka body models and a set of both static and dynamic measurements. All of these data were processed by using dedicated softwares such as MeshLab and CloudCompare to analyze dynamic shape and measurements of the karateka body in motion, the dynamic deformation of the karate-Gi's elements (pant and vest) as well as their physical fit both in static and dynamic poses. Finally, we are also working on using the obtained rigged animated 3D karateka avatars to virtually simulate the dynamic fit and deformation of the studied karate-Gi, with 3D garment's virtual design and simulation softwares like VStitcher and Clo3D.