You don't need us to tell you what a too-tight sheath dress feels like on a July subway platform.

Back sweat is a fact of New York life. Gross? Yes. Normal? Absolutely. All hope lost? Eh, not really.

Along with that trusty paper fan that lives in your handbag, a breezy swing dress will do wonders when the 49th Street station feels more like Dante's ninth circle. The lifesaving trick: Look for frocks that hang effortlessly away from your torso. The more that air can circulate around your actual skin, the less likely you'll become a human puddle.

Check out some loose numbers to help you survive the next three months.

More from PureWow:
Summer dresses that won't break the bank
30 reasons we love summer
The secret to a summery red lip