The contract will see DCC supply trousers, shirts and jumpers to Geo Amey over the next three years.
Geo Amey provides secure prisoner transportation and custody services across England and Wale, on behalf of the Ministry of Justice and the Youth Justice Board.
Its staff transport adults and children in custody and provide supervision of prisoners in custody suites and defendants in court rooms.
Liz Hancock, HR analyst at Geo Amey, said: “Uniform is integral to our company as it is the identity of our frontline staff who need to look professional at all times.
“The quality and accessibility of the uniform Direct Corporate Clothing have supplied has been exceptional and we are hoping to continue with our great relationship for a long time to come.
“Nothing has been too much trouble and when we need them to, they pull out the stops to get us what we need.”
Sam Sohal, joint managing director of DCC, said: “Our online ordering system and ability to stock large volumes of each workwear item mean we are able to respond at short notice and turn round orders quickly for Geo Amey.
“We are very pleased to count them as a new client and look forward to delivering our high standards of service to them over the next three years.”