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.
If you're not going to run, don't wear running shoes. 16 Ways To Dress Like A Grown Man Invest in quality. Every man should own a black lace-up shoe (they match everything) and a few slim, pointed ones.