No, I don't think formal clothes are always necessary at work. Many places now let you wear casual clothes because it's more comfortable, and when people are comfortable, they can work better.
不,我认为在工作中正装并非总是必要的。现在许多地方都允许穿便装,因为这样更舒适,而当人们感到舒适时,他们会工作得更好。