NFPA 70E Table 130.7 (C)(9) 

Lock Out Tag Out:  Circuit Breaker, or Fused Switch, or Starter Operation with the enclosure doors closed, In Panelboards, Switchgear, and MCCs  you must wear Hazzard/Risk Category 0 Clothing.

Risk Category 0 = Long Sleeve Shirt, Long Pants of Nonmelting Fabric with a weight of at least 4.5 oz/yd2

This Lockout Jacket meets this requirement.