Highly recommended for this mod to work properly:
Sangres Shirt Picker by Kuziz (Floral Blue Shirt option)

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This mod replaces Sangres's default blue shirt with the default business outfit, also removes his moustache. Template for Sangres's textures will be released shortly.

Installation:

Put the "Sangres Casual Business Shirt" in your Mod_Override folder which is located in here, if not then simply create one.

Location:
C:\Program Files (x86)\Steam\steamapps\common\PAYDAY 2\assets\mod_overrides\

P.S, If you want his moustache back then please remove the following file "npc_criminal_max_hair_df" which is located in:
units > pd2_dlc_max > characters > npc_criminals_max and remove it.