I have stamped on similiar fabric - I decorated my neice the Karate Kid's sports bras using Kanji and a retired Asian set (cann't recal the name; it's about 3 years retired). I used craft ink and then heat set with an iron. Thus far she says that the images are holding up. I'd imagine that, much like t-shirt, these will be washed often. I hope they hold up to frequent washings. The tea towel I stamped for myself has held up well but that material is 100% cotton and the sports bras were a lycra/cotton blend.
Hope that helps. T-shirts are pretty cheap. I'd take an old one and experimet stamping and washing to see what happens.
Kim
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