制服帽 meaning in English

regulation cap
uniform cap

Rostov , his eyes avoiding denisov , began buttoning up his jacket fastening on his sword , and putting on his forage - cap
罗斯托夫回避杰尼索夫的目光，扣紧制服上衣，扣上佩带的马刀，戴上制服帽。
" confound you and your punctuality ! " said andrea , throwing himself into a chair in a manner which implied that he would rather have flung it at the head of his host
安德烈说，他走了进去，使劲把帽子一摔，但没摔到椅子上，那顶硬边的制服帽在地板上骨碌碌地转了一个圈。