pith hat (also `pith helmet)

hat made of dried pith(1a) worn (esp formerly) to protect the head from the sun 木髓制的遮阳帽（尤指旧时用的）.

pit, pit pony, pit-a-pat, pit-a-pat (also pitter-patter), pit-head, pit-prop, pitch, pitch-and-toss, pitch-black, pitch-dark, pitch-pine, pitchblende, pitched, pitcher, pitchfork, piteous, piteously, piteousness, pitfall, pith, pithily, pithiness, pithy, pitiable, pitiably, pitiful, pitifully, pitiless, pitilessly, pitilessness, piton, Pitot tube, pitta, pittance, pitter-patter, Pittsburgh, pituitary, pity, pityingly, pivot,