I think your drastically overestimating the cost of landfill space, and t-shirts. A middle class american's time is worth at least 20$/hr, a t-shirt costs $2 t

I think your drastically overestimating the cost of landfill space, and t-shirts. A middle class american's time is worth at least 20$/hr, a t-shirt costs $2 to make from scratch in a factory and the landfill volume of that shirt might round up to a penny. Disposable goods are disposable because people tend to act rationally about time and costs.