Corridor shirts are known for their perfect fit.
Three concave panels on the back give the shirt subtle shape - a masculine silhouette with a slim fit and clean drape across the back. The panels let the shirt move with the body in a way that pleats and darts do not. The fit also maintains pattern matching from the body to the yoke to the collar - even to the under collar.
After experimenting for years with pleats and darts, designer Dan Snyder, found the best way to fit a shirt was to adapt this style from the 1950s.