Samples of red-coloured underclothing used in the Active Area of the Chalk River laboratories where radioactive contamination of clothing was a possibility. Many workers in the Active Area at Chalk River performed tasks in areas where it was possible their clothing might come in contact with radioactivity. To diminish the chances of personal clothing being contaminated, these employees entered a clean change room, removed all personal clothing and donned special AECL-issue clothing before their work shift. At the ends of their shifts they returned to the change rooms, removed the possibly-contaminated clothing, deposited it in used-clothing bin and donned their personal clothes. To avoid possible lapses in memory, the AECL clothing was issue in a vivid red colour which reduced errors greatly. Lab coats or coveralls were used over these underclothes. A special laundry service dedicated to the Active Area cleaned possibly-contaminated clothes between uses.