I also want to know thoughts on driving loafers or shoes to be worn in summer with light (in color and weight) denim with an ocbd or polo. I had considered espadrilles but I think that's too casual. Sneakers are an easy choice but looking for some sort of sockless option
My favorite for all-around Spring Summer casual shoes are suede bucks. They get better the more well worn they become. I wear mine with cotton suits or a navy blazer and linen pants. Their neutral color goes with almost anything. I always get compliments on them and best of all they are comfortable. I've even taken them as my one-shoe® on semi-casual business trips, walking trade shows in the summer. I will be wearing a pair to my sisters wedding on the beach in Maine this summer.