I'm trying something different and will report back. I've ordered custom shirts from two different companies (one in the U.K and one here in the states that make made to order pilot shirts with button down or straight (they offer custom engraved brass collar stays so none of that flipping up like many, including A Cut Above, tend to do with the weak, stitched in plastic collar stays) collar. They are made to your specs so the tail can be a little longer to stay tucked and the sleeve length, width can be custom.

1. Whitepilotshirts.com (U.K)
2. Custom Pilot Shirts (U.S)