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.
What does the color of your outfit say about you? Different colors offer subliminal messages and illicit emotional responses. Be aware of your colors when you go to an interview, or when going to work!