Eldridge was the original Harry Rothman's in-house brand.
The original Harry Rothman store carried both overstocks from Norman Hilton and others. It removed the label and placed its Eldridge label. Harry Rothman also purchased clothes from manufacturers. Therefore, this item might have been either an overstock or a coat made for Rothman's.
The original Rothman store was at Fifth and 18th Street where Daffy's now stands. It was a very large floor with a second floor. The store was classic discount emporium. It was not fancy, and the decor was probably unchanged from the 1950's. They had testimonials from various businessmen, politicians, and diplomats on the columns.
It thrived in the age when men had to wear suits every day to work, and men would visit at least twice a year to replenish their wardrobe. It sold classic American business suits. I think that most of the suits were full canvas because that was what was sold at the time. I used to buy Norman Hilton suits there. I also bought some Sulka dress shirts (with the label) which they shortened for me.
The coat is probably full canvas because Rothman carried better quality clothes.