Shortly after the transition started to happen between tunic shirts to full button “coat cut” shirts, the question of what to do with the tails came about. Some manufacturers, like Signal in the previous post, opted for curved front shirt tails which overlapped to avoid gapping. Others, like Olus, decided to extend the tails, and make a shirt/drawers combination. Sort of a sleeved athletic union suit with a collar. These ads date from 1914 to 1916.