Thanks @peppercorn78 . I didn't realize there was a plain brown calf so I did a search and found these:
I have this fabric in both the default dark navy and a medium wash. The dark denim was stiff until about the 3rd wear and is currently breaking in nicely. The medium wash was extremely soft upon delivery.
I've worn mine for about a month now. The color has faded ever so slightly in the elbows and collar due to the nature of indigo, but personally this only adds to the charm of shirt not really meant for business wear.