For less formal weddings or smart summer events in general, then one's wardrobe should revolve around the linen suit. Linen is the perfect summer fabric, being extremely breathable and with the ability to wick away moisture. On top of that, it is very lightweight, and the inherently bright summer colours do a very good job of reflecting the sunlight. Plus, you are at the liberty of pairing the suit with a linen shirt, too.
Don't forget that the pocket square, often merely thought of as a superficial affectation, does in fact come in handy as a functional brow wipe when you are perspiring under the glow of the sun, so if you intend to use it as such, opt for a linen style rather than a silk one.
For the Lady
Ladies have the advantage of being more versatile when it comes to hot weather dressing but they still need to maintain a level of sophistication and decorum. Fabric choice is everything of course, with both linen and silk being excellent options for both dresses and coats when the mercury is rising. Both have the glorious advantage of being stunning visually, with linen bringing a lovely textural element to the look while silk boasts an inherent glamour thanks to its natural shine which is accentuated in the sun.

Silk georgette is another wonderful high-summer fabric that works wonders in the heat. Its 'barely-there' sheer quality creates a delicate femininity, as well as keeping you effortlessly cool. Silk satin, too, is another excellent iteration of silk that has a dreamy fluid quality and always feels cool on the skin. Linen is a fabric we love working with as it has such a wonderful textural quality, on top of all its innate warm-weather characteristics. It's why we have created a number of summer coats in linen, too add a comfortable and tactile element to elegant summer wedding dressing.