Rule #1
Consider The Updated Linen Suit
If you thought linen was a material worn only by Sun Belt retirees, this exquisite Tom Ford suit is here to make you reconsider. With its patch pockets, peak lapels, cheerful color, and crisp construction (it's woven with silk and light wool for extra structure), it's the epitome of contemporary summer elegance and proof of the power of a fashionable reimagining. For other ways to elevate your warm-weather style—including more must-have linen pieces—read on.

Right: Suit ($4,670) by Tom Ford. Shirt ($120) by Club Monaco. Socks ($28) by Falke. Shoes ($1,460) by Tom Ford. Sunglasses ($405) by Oliver Peoples.

Rule #2
Think Beyond the Khaki Suit
Tired of washed-out tan two-pieces? Darker hues like green, brown, and burgundy are surprisingly stylish and seasonally appropriate.

From left: Suit ($4,895) by Ermenegildo Zegna, shirt ($235) by AMI, tie ($250) by Dunhill, shoes ($920) by Bottega Veneta. Suit ($1,495 for jacket, $450 for pants) by Todd Snyder, shirt ($615) by Louis Vuitton, tie ($145) by Paul Smith, belt ($60) by Cole Haan, shoes ($695) by Jimmy Choo. Suit ($1,070 for jacket, $570 for pants) by Dries Van Noten, shirt ($295) by Band of Outsiders, tie ($155) by Ralph Lauren Black Label, shoes ($395) by Boss.

Rule #3-6
Dos and Don'ts: Wearing a Suit in Summer
Do select an unlined, lightweight construction or you'll end up sweating buckets.
Don't pair your warm-weather suit with a straw boater—the season's biggest cliché.
Do feel comfortable dressing your summer suit down with sneakers or a tee.
Don't be sloppy. It's a suit: Get it tailored.

Rule #7
Make Room for the Single-Pleated Chino
Pleated khakis have gotten a bad rap as a staple of casual Fridays. But when they're crisply tailored and feature just a single fold, they can deliver a polished look that their flat-front brethren simply can't compete with.

From left: T-shirt ($40) by Club Monaco, pants ($250) by A.P.C., shoes ($65) by Adidas Originals. T-shirt ($92) by T by Alexander Wang, pants ($550) by Salvatore Ferragamo, shoes ($88) by Banana Republic. T-shirt ($30) by Lucky Brand, pants ($198) by Unis, shoes ($795) by Saint Laurent by Hedi Slimane. T-shirt ($72) by ATM Anthony Thomas Melillo, pants ($189) by Won Hundred, shoes ($75) by New Balance.