The dataR.cpk file found in Persona 5 Royal contains a GMD model folder, Model (P5R). Each folder is categorized by character ID number. See Model (P5R) for a full list of ID number with character names and descriptions. 4308 refers to Male Pedestrian, and contains 2 GMD models related to him.
|6||c4308_006_00.GMD||Midwinter suit||Business suit for midwinter|