In the BVP Program, "uniquely fitted vests" means protective (ballistic or stab-resistant) armor vests that conform to the individual wearer to provide the best possible fit and coverage, through a combination of: 1) correctly-sized panels and carrier, determined through appropriate measurement, and 2) properly adjusted straps, harnesses, fasteners, flaps, or other adjustable features. The requirement that body armor be "uniquely fitted" does not necessarily require body armor that is individually manufactured based on the measurements of an individual wearer. In support of the Office of Justice Programs' efforts to improve officer safety, the American Society for Testing and Materials (ASTM) International has made available the Standard Practice for Body Armor Wearer Measurement and Fitting of Armor (Active Standard ASTM E3003) available at no cost. The Personal Armor Fit Assessment checklist, is excerpted from ASTM E3003.

In addition, a certification section has been added to the 2019 application (in the BVP system) stating the jurisdictions and law enforcement agency are aware of and will comply with this requirement.