This is a Sunday brunch with the guys or family outfit! I feel like you don't have to wear dress pant to wear a blazer with a dress shirt. Just throw on some plain, simple jeans and add on that beige blazer with a neutral color dress shirt.
Men's Light Blue Dress Shirt, Brown Chinos, Black Suede Loafers, Navy Horizontal Striped Tie
This one's pretty self-explanatory, but pay attention to which colors go with which so you'll look your best. Also don't be afraid of seersucker or linen during the summer seasons, because it'll keep you cool and help you stand out from the crowd, too.