Recreational suit wearers often belong to the bare ankle club, cuffing their suit pants to reveal sockless feet in any number of shoe varieties, or when it's cold, exposing crazy sock patterns artfully crumpled around the ankles. These suits are more fitted and often more stylized, sometimes more colorful, usually have a pocket square and definitely don't require a tie. Shoes from sneakers to oxfords can be worn with this kind of suit and if you're feeling adventurous, mixing and matching the tops and pants is common practice. Just like girls have "day" dresses and "day" heels, now the guys get to play, and it's a pleasing trend to discover.
How do you tell the difference between a suit for fun and a suit for formal? Well, I guess they aren't always so different, but you can kind of tell. Tie (bonus points for tie bar!), and formal shoes finishing off a fully suited look, toned down colors and a limited color/pattern option for the shirt underneath are all telling signs. Oh, and if the pants are the deemed "appropriate" length, meaning no ankles in sight, you're probably looking at someone with a place to go.