19th Century Shopkeepers

I found this old photo in a very old dry goods store on 3rd and Market st in Philadelphia.

This is not the store in the photo, perhaps one of their wholesale customers out West? 

The guy on the far left has what look like Stifel indigo fabric sleeves to protect his white shirt underneath. Another fellow to the right has plainer ones as well. You can see they buttoned to the white shirt at the top.