The thing that sets seersucker apart from other suiting materials is that it’s a fabric that has been crafted historically to combat heat. Originally from Persia (the word seersucker is probably derived from the words sheer and shakar, meaning “milk” and “sugar” in reference to the smooth and rough stripes in the weave), the material first became popular with western wearers in the warmer British colonies such as India, before making its way to the sultry, humid southern United States in the nineteenth century.
The secret of the fabric is in its puckered texture - this is intentionally created through the weaving process to hold the fabric away from the body when it’s worn, creating little pockets of air that allow the warmth you generate to disperse. Adding to this, often a jacket will only be half or buggy-lined, for further breathability. Of course, a light, unlined cotton or linen will have a similar effect, but the genius of seersucker is that due to its intentionally textured appearance, you won’t look like a crumpled mess the first time you sit down at that summer wedding. It counters both creases and a warm climate.