I actually don't believe you. Like I don't think your shirt fell apart like that, and I don't think you bought a plastic shirt.
Fabric lasting a long time isn't odd. I've got a synthetic fabric gym bag from 20 years ago that's fine. I've got a 10 year old synthetic blend shirt that's never had an issue. I've got cotton shirts in the same range.
Synthetic fibers tend to be more expensive, and are more durable for the fabric weight. It's why they use them for safety equipment.
You're acting like none of us are familiar with clothes. Where are you buying disintegrating shirts, and why ? I've never encountered that and I've been wearing clothing for quite a while. I've only had any type of clothing tear like that if it snags on something like a nail.
:) that's why I referred to available technology, not the word. "Computers" were available, both as people and as semi-algorithmic adding machines, but the speed, capabilities and operating principles were different to a degree that the only similarities are a name and an abstract mathematical model.
Although picturing the brigades of women with adding machines occasionally sending a telegram to create a 1900s Internet is amusing.