I would love to see another 10oz. denim shirt. I have the IHSH-350-IND 10oz Selvedge Denim Western Shirt - Indigo from a few seasons back, which is just amazing. The 10oz. makes it comfortable to layer and suitable for all seasons. Perhaps in black, fading to grey..
Another idea maybe 8-10oz. denim/chambrai shirt in Oxford cut? button down collar perhaps, one pocket, more appropriate for the office and even better to layer with vests etc. I noticed Orslow make those, but they tend to be a bit to baggy for my taste.
Cheers!