What's the meaning of "blouse" here? In the morning, before first light, we dragged ourselves over the sides of the company’s deuce-and-a-half trucks and convoyed to the range. The snow had changed to rain overnight and we pulled our hoods over our helmets as far as we could. The rain was cold, percussive. The drops slid down the backs of our blouses and jackets, each one seemingly on the cusp of freezing. What's the meaning of "blouse" in the last sentence? Why doesn't the writer use "shirt"? Thanks!