"He who marches out of step hears another drum." ~ Ken Kesey
half the battle of catching shirts off the belt, is how the unloader put them on the belt. Make sure that shirts being pulled off the press and laid on the belt, have the shoulder seams facing back so it's easy for the catcher to grab the seams, then stack quickly. Nothing irks me more than a lazy off loader who simply tosses the shirt on the belt passing their piss poor performance down the belt to the catcher who has to struggle to get the seam and stack.
A "bad" shirt is turned 90 degrees so the catcher can see it also. Throughout the shop, I preach that the next person in the process is your customer, and it's you job to make their job easier if possible. Nothing you do can knowingly slow down the next part of the process. (sorry for wandering off subject)