Industries change ALL THE TIME. I don't know what it takes to make a t-shirt, but I have to imagine it is becoming automated to the point where not as many factories are needed. There's also shifts in consumer buying that happen.
I'm sure when cars were invented there were closed down stables all over the place. Progress happened. Rural textile plants have left in favor of luxury car makes like BMW opening plants. Don't confuse a particular industry changing to manufacturing as a whole. The value of products produces simply doesn't show manufacturing leaving. In fact, the high dollar products are moving to the US.
I'm sure when cars were invented there were closed down stables all over the place. Progress happened. Rural textile plants have left in favor of luxury car makes like BMW opening plants. Don't confuse a particular industry changing to manufacturing as a whole. The value of products produces simply doesn't show manufacturing leaving. In fact, the high dollar products are moving to the US.