The pattern and SS badge is downloaded from M's Deck Japan, material is a kind of paper with flannel texture (I don't know the official name for the paper, they are available in grey, green, black...)  Anyway, the cap looks pretty convincing after assembly.  The whole process only takes 15 mins, all you need is glue and X-ACTO.
The Wehrmacht Field cap pattern is also downloaded from M's Deck, excpet the material I used is standard white paper, painted with green after assembly

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