Once you start to think of a blazer as an outerwear piece, instead of part of a suit, you'll be able to find new ways to get more use out of it.
Material is a huge factor in pulling off suiting separates. The JackThreads Seersucker and Nylon blazers are less traditional, and were designed to be more like tailored jackets.
Striped Tee + Seersucker Dress Pants + Clean Shoes = After-Hours Nautical Vibes
The easiest way break up a suit is by pairing a blazer with a nice pair of chinos or your favorite jeans. If you want to wear the suit pants, keep it casual with a t-shirt or polo.
Navy Blazer + White Tee + Dark Denim + Loafers = Casual Suiting 101