The best replacement for sheath dress is shift dress.

The best alternatives to sheath dress are rated as following:
★★★★★  shift dress
★★★★  shift
★  bodycon dress

Your alternative for sheath dress is not listed? Suggest!
Speaking about sheath dress, one probably shouldn't forget about long jacket.

Other search terms related to sheath dress and their ratings are:
★★★★★ long jacket
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sheath dress
shift dress
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