Soapy had confidence in himself from the lowest button of his vest upward.
upward 表示“方向”的副词,跟from....搭配,意为“从...开始朝上”,不必细分。
from the lowest button of his vest upward, 是个习语,修饰 had confidence,强调信心十足。意为“完全彻底;彻头彻尾”。
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