How can you make a tubular bandanna AKA a buff? (I would like it to be seamless if possible)?

Knit it in the round, like they do socks...
If you really need it to be seamless, you'll have to learn to weave. Google "doubleweave" for info on a book that can teach you how.
Otherwise, just find some stretchy fabric you like, cut a rectangle of the size you want, fold it in half, and sew along the edge opposite the fold.

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