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You could use fusible interfacing, which would basically glue a very thin layer of stiffer fabric to the T-shirt fabric. That would make the T-shirt fabric easier to work with, and more fit for purpose as a cap fabric.
I haven't done this before with old T-shirts, so I can't guarantee the finish, but it should work, theoretically.
If you're very keen to give it a go, let's chat in PMs to arrange things?
Thanks for the quick answer.
Would it be possible to sew/glue the t-shirt fabric onto the fabric panel that you’d normally use? So it could be used as the outer or the lining?
Just spitballing, have no idea if it’s possible and if it’s difficult/time consuming to do.
Thanks..