Q: when they aren't wearing their race uniforms of course
A: junior and kasey kahne are both fairly well-known for the jeans and t-shirt casual style. gordon and johnson are better known for being more stylish in a more metropolitan setting. jeff in particular always looks stylin' every time he and ingrid "appear" on TMZ. but from pictures and videos i've seen, i'd have to go with the "rowdy" style - the extreme sports/surf-and-skate wear casual style, and i lean toward that. although i personally can't pull it off at my age, i like that look in general when worn well.