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Between the air-conditioned office and a steamy commute, dressing for work during a heat wave can be a challenge — but it's not impossible. Enter: the sheath dress, the ultimate go-to frock for looking professional and keeping it cool. Pair this traditionally form-fitted number with a rad blazer and you've created the perfect modern-day power suit. Then, when it's time to punch out, shed that layer and you're all set for happy-hour cocktails — we'll drink to that! So, save yourself some time in the morning and scoop up one of these 14 killer sheaths before sweater-dress season takes over.