How many t-shirts do I need for each size?
What is a SIDE of a t-shirt? It's either the front OR the back side of the t-shirt.
We only need the designated number of sides of shirts (front or back), not full t-shirts. For example, a full size blanket can be made with 15 full t-shirts using the fronts and backs, or 30 shirts just using one side, or any combination in between.