The sleeve actually re-sews itself when you adjust your arms.
Also... what does shanked mean? I know you can shank buttons, and shoes have a (sometimes leather or metal (alden)) shank. I am assuming these are different things.
And not enitrely sure Murl didn't just want an exuse to unbutton his shirt for a pic.
Guilty. I replied to your PM asking me to undo another button....sicko.