Hi Kamil, Strelets' sculpting has improved over the last year or so, so great indeed to see their latest sets.
They tend to add "typical" headgear like NZ hats, sun hats etc. to their WW2 Commonwealth sets in order to make them look different from your average set of British infantry. The same for this set. Surely few people would wear a cap in battle in 1918 if they could get a helmet so this is some artistic license. Regards, Pat