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.
Getting to wear your favorite pair of jeans is the best part of every casual Friday. You can always complement them with dress shoes, but you can also insist on being relaxed all the way through with leather laced-up boots.