I have been wearing a Magnum RD short-sleeved shirt from the Magnum Boot Company that I think will interest you. Magnum long ago branched out from boots and now makes an entire line of footwear, apparel, and accessories.
The shirt I am testing is a Desert Sage colored short-sleeved shirt fit for covert carry or regular off-duty wear. The RD stands for “rapid deployment.” It is styled like any other high end sporting shirt you might find at a retailer, but it some great bonus features.
The 5.4 oz ripstop cotton material is a nice compromise, having both a light weight and durability. I think this shirt can go from either hot to chilly temperatures without complaint from the wearer.
It is cut generously, which is terrific for concealed firearms carry. It does not have a breakaway side, like some firearms-intended shirts, but that is a function I am not fond of anyway.