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. 4291 refers to Female Masked Passerby, and contains 3 GMD models related to her.
|3||c4291_003_00.GMD||Summer Casual||Casual outfit for summer|
|4||c4291_004_00.GMD||Winter Casual||Casual outfit for winter|
|6||c4291_006_00.GMD||Midwinter Casual||Casual outfit for midwinter|