pith helmet
From Longman Dictionary of Contemporary EnglishRelated topics: Clothespith helmetˌpith ˈhelmet noun [countable] DCCa large light hat worn especially in the past in hot countries, to protect your head from the sunExamples from the Corpuspith helmet• Small wonder that doctors are calling for the return of the parasol and pith helmet.• The pith helmet with an attentive elephant in waiting.