The Unitog brochure pictured at the link is the NEWER of the two versions that I know of. The earlier version does not show an automobile on its cover. My coveralls are of the Lot 432 type (as shown in the 1948 brochure).
I know there were two sizes of patches, but I am not sure on the dimensions for the larger size. The Unitog materials only refers to the smaller patch for above the front shirt pocket area; these were offered free (one per garmet ordered, additional "at slight extra cost").