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Leaves the bottom button of his vest undone.
穿马甲时不扣最下面一粒扣子。
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One button on the vest is loose.
背心上的一粒钮扣松了。
Wear a wool vest with preppy pieces, like a crisp button-down shirt and pleated miniskirt.
穿上羊毛的学院风背心，配上领尖有纽扣的衬衫和带褶子的迷你裙。
By the way, the fleece vest over a button-down shirt thing originated at SAC.
FORBES: Dress for Success on Wall Street
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