The Didcot Shirt is a descendant of the Railway Collar Jacket, produced in very small numbers in 2012. Both garments take their collar design from a British Rail uniform overshirt discovered in the archive of the Great Western Society at Didcot.

The shirt is technically collarless, but a wide shaped facing is sewn onto the outside of the neck, pointed up at the placket, making the shape of a standard shirt collar. Hand pockets are sewn into the side seams. The sleeves are pleated into false cuffs, and the hem is finished in a gentle curve.