Uniform regulations are decided by your agency. However, there are certain things all officers must abide by.
Unrealistic items
You should not be wearing the following while on standard patrol
Oversized items
Not realistic items
Not realistic characters
Realistic items
You should be wearing the following while on standard patrol
Class A,B,C or department issued attire
Duty belt
Vest (optional if visible however you will still have a vest under your shirt if vest not visible)
Presence
While acting as Law Enforcement you should look presentable and not sloppy at all. You represent your department and should not be fooling around while on duty.
Any questions about your uniform, consult with your Departments High Command.