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. 4122 refers to Male Kosei Student, and contains 3 GMD models related to him.
|1||c4122_001_00.GMD||Summer Kosei||Kosei uniform worn in summer|
|2||c4122_002_00.GMD||Winter Kosei||Kosei uniform worn in winter|
|5||c4122_005_00.GMD||Midwinter Kosei||Kosei uniform worn in midwinter|