The OSHA Standards addressing Personal Protective Equipment (PPE) for General Industry is located within Subpart I of 29 CFR 1910. These standards consist of General Requirements (1910.132), Eye and Face Protection (1910.133), Respiratory Protection (1910.134), Head Protection (1910.135), Occupational Foot Protection (1910.136), Electrical Protective Devices (1910.137) and Hand Protection (1910.138). Additionally, there are 2 non-mandatory appendices A (References for Further Information) and B (Compliance Guidelines for Hazard Assessment and Personal Protective Equipment Selection).
Keep in mind that the standards alone are not going to provide all of the information that you will need to be effective in your PPE program, as reviewing and being familiar with the Interpretations, Letters of Understanding, and Directives will also benefit you in selling your plan and obtaining the necessary buy-in from management and employees.