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Her appearance looked effortless; a shift dress with a classic sweater, dainty jewelry, and mid-heel pumps.

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    No: not a semicolon but rather a colon or em dash is called for there. – Brian Donovan Sep 25 '15 at 0:32
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Punctuation is a matter of style, and as such you should consult your manual of style. I use The Chicago Manual of Style, which recommends that when semicolons are used, they should separate clauses (or lists of items that themselves require commas). What you have following your semicolon is not a clause. The recommended usage would be

Her appearance looked effortless; a shift dress with a classic sweater, dainty jewelry, and mid-heel pumps made up her wardrobe.

You may use a dash to indicate that the following items are an expansion, here of her appearance:

Her appearance looked effortless—a shift dress with a classic sweater, dainty jewelry, and mid-heel pumps.

You may use a colon to indicate that the following items are an "illustration or amplification," here of effortless couture:

Her appearance looked effortless: a shift dress with a classic sweater, dainty jewelry, and mid-heel pumps.

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