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.
Like this look with denim shirt, Barrow Bologna chinos, IWC watch mod. Portuguese and knitted tie. I usually like aknitted tie with with a denim shirt. But not with chinos/khakis. I'd rather had this look without the tie