4.1 This specification provides performance properties for textile material and design characteristics for clothing that represent minimum initial requirements for primary and secondary protective clothing.
4.2 Although the specifications for primary protective clothing are written for outer garments, it is recognized that optimum protective performance to severe exposure involves the use of an appropriate system including work clothing underlayers and undergarments.
4.3 It is permissible for one or more of the requirements in Table 1 to be modified upon agreement between the buyer and seller.