How do you make a cabbage tree hat?

What does a cabbage tree hat look like?

The Powerhouse Museum describes a cabbage-tree hat thus: Finely woven natural straw coloured hat; high tapering domed crown, wide flat brim; applied layered hat band of coarser plaiting with zig-zag border edges. … Cabbage tree mobs are recognised as a predecessor of the larrikin.

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