I have bought some T shirts for my grand children to colour in Transfers on them , I have permenant markers in loads of colours from when they coloured in beach bags earlier in the year.
Dunno about ordinary permanent markers, nannybooby. But you can get permanent markers for T shirts. http://www.amazon.co.uk/T-Shirt-Graffiti-Pens-Permanent-Markers/dp/B001NF61JK
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