This recommended Practice (RP) addresses the gowning of personnel as a critical aspect of cleanroom contamination conrol. The latest edition includes a new 20-page supplement, Guide to Measuring Cleanroom Garments, which provides recommended garment measurement specifications. The RP provides non-mandatory guidance for the selection, specification, maintenance, and testing of apparel and accessories appropriate for use in nonaseptic and aseptic cleanrooms. Supersedes previous editions of RP-CC003.