Full disclosure: I bought "new" gardener's tape.

Could I have torn up old t-shirts to tie up my tomatoes? Yes. But, that would take an awful lot of time (I'm planting a lot of tomatoes). And I don't really have old t-shirts to spare: the very worst turn into the odd dusting rag (I never seem to have enough) and the rest go to Goodwill, where they likely go to better use than tomato ties. So, I allowed myself to purchase the gardener's tape, which is so very handy and convenient.