He now wears shining boots with hardly a hob in 'em, two or three times a-week, and a tall hat a-Sundays, and 'a hardly knows the name of smockfrock.
Thomas Hardy. Far from the Madding Crowd (1874)
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on the far side of a field on his left hand he could see six or seven men in smock-frocks with hay-forks in their hands making an offensive approach towards the four railway agents who were facing them,
George Eliot. Middlemarch
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The watchmaker, always poring over a little desk with a magnifying-glass at his eye, and always inspected by a group of smock-frocks poring over him through the glass of his shop-window, seemed to be about the only person in the High Street whose trade engaged his attention.