Vintage 1940s Adjustable Pith Helmet Safari Jungle Sun Hat Great For Halloween!. Shipped with USPS Priority Mail.Often called a pith helmet, this is actually a pressed fiber sun helmet. These were in use in the US military from 1934. Many were made during World War II and the period immediately after WWII (like this one 1948). They still have limited use in today's military.This helmet is beautiful and in great shape with some minor discoloring as can be seen in the pictures ...The helmet fits about size 7 now, but is adjustable. The original leather adjustment lacing can also be replaced to accommodate larger sizes. NW4