Here's a couple of unusual madras shirts I thrifted recently.
Vintage Gant - it's like a safari shirt, but made of a solid light blue madras. Note the three pockets on the front and the buttons on the outer sleeves for buttoning down the sleeves when you roll them up.
Vintage Willis & Geiger from when they still manufactured in the USA. Huge horn buttons, two buttons on each chest pocket massive locker loop, the back is a separate panel, and elbow patches!