DIY Hardware Store Giant Knitting Needles from inspiration & realisation here. I’ve seen up to size 15 at Michaels that are pretty short and expensive. Donatella is going to use thick tee shirt yarn with these huge needles. Her DIY tee shirt dyed yarn tutorial is posted here. *Last year I posted the extreme knitting needles for that gorgeous wool blanket that was knitted on PVC pipes here. *EDIT: Donatella said these were equivalent to US Size 36 or mm20.