The Frock Shirt is a combination of a three-pocket work shirt and a tailored frock coat. The fabric is cut across the grain, with no side seams, and the shoulder seam is sloped back from the centre of the neck to the back of the armhole, connecting with the sleeve seam which runs along the back of the sleeve to the cuff. This way of cutting recalls 18th and 19th Century dress coats, where the sloped shoulder seam keeps the garment cleaner from the front, and the slight bias allows the fabric to be stretched in over the canvasses.

The shirt is cut with deep scooped tails, and is sewn with all-cotton thread and finished with dyed cotton-covered metal buttons and a Made in USA blue label.