风衣后面那块布是干啥用的？

风衣诞生于第一次世界大战期间，它的设计初衷是为英国士兵防风防雨。其中，这块像小翅膀一样的布料，就起到了防雨的作用。它的存在，可使腰部以下布料不被雨水打湿，从而保证了士兵行动的便捷。

所以这块布真正的作用，并不是为了美观，其实是用来挡雨的！

The trench coat was born during World War I, designed to protect British soldiers from wind and rain. The small flap of fabric, resembling a wing, played a key role in keeping the lower part of the coat dry, ensuring soldiers could move easily.

So, its true function wasn't for style, but to shield from rain!

之后，人们对时尚越发有个性的追求，这块布在设计师手中也衍生出不同的形态，较热门的有“一片式”、“两片式”、“蝴蝶式”等等。

当然，它的用料也十分讲究：一些知名的服装品牌，就会选用防水的面料制作风衣。

如今，有不少人觉得，这块布的存在有点“碍事”。因此风衣的款式变得愈发简约起来，也更贴合当代人的穿衣需求了。

Today, many people find this flap of fabric a bit "inconvenient." As a result, trench coat designs have become increasingly simplified, better suited to modern fashion preferences.