Escaped prisoner John Anslow was wearing brightly-coloured jail clothing when he jumped from a prison van last month.
Police have issued images of a distinctive blue and yellow top and trousers worn by murder suspect John Anslow in the hope that more witnesses will come forward.
A picture of the 'getaway' car used by the offenders has also been released, as officers revealed more information about the vehicles used in his escape and the route they took.
Three men wearing balaclavas, two of whom were carrying sledgehammers, smashed the windscreen and driver's window of the prison van as Anslow was being transported to Stafford Crown Court.
Anslow, 31 escaped from the van near to HMP Hewell Grange, in Tardebigge near Bromsgrove, at 8.20am on 23 January.
The yellow and blue prison suit Anslow was wearing when he escaped. It is thought the prisoner might have discarded the bright clothing on or since his escape.
A grey Mercedes C63 AMG Estate was a second car used by the offenders.
A silver VW Scirocco, registration BT59 NXC, was used before they abandoned it and switched to the Mercedes.
Police said the Mercedes travelled north along the B4096 Hewell Lane on to Alcester Road to the M42 Junction 1 island.
It then went on to the B4096, on the Old Birmingham Road towards the Lickey Hills, travelled down Rose Hill and turned left into Lickey Road in Cofton Hackett.
A £10,000 reward has been offered for information about Anslow, from Tipton, that leads to his arrest and return to prison.
Police have released a picture of the type of vehicle used in John Anslow's escape
Anslow was one of five men charged with the murder of businessman Richard Deakin in Chasetown, Staffordshire, in July 2010.
Searches have been carried out by police in the Tipton area following Anslow's escape but he remains at large.
A 44-year-old man arrested on suspicion of assisting an offender following the escape remains on police bail.
Police have said they consider Anslow to be very dangerous and have warned anyone who sees him to not approach him and to contact them immediately.
Detective Superintendent Wayne Jones, from Staffordshire Police, said: "We're determined to catch Anslow and a dedicated team of detectives are following several lines of inquiry.
"A substantial reward of £10,000 remains on offer for anyone who can give us information that leads to Anslow's arrest and return to prison.
"We've had over 100 calls from across the country so far and are continuing to liaise with other forces and agencies nationwide. Our officers are working closely with colleagues at West Mercia and West Midlands police forces.
"We're particularly keen to speak to anyone who saw the Mercedes on Monday January 23 or any suspicious activity in the areas surrounding the prison during the weekend before.
"We also need to talk to people who may have seen Anslow in the distinctive prison suit - or the discarded suit itself after the incident."
Anyone with information is asked to contact police on 01785 232503 or Crimestoppers, anonymously, on 0800 555 111.