^ Chinos are perhaps the most deceptively simple element of your wardrobe. I used to think that chinos are just chinos and they are just for kicking around, but it turns out, there are so many nuances in the construction of chinos that make them what you can wear with a suit or what you wear to a football game.
First is fabric. Finer fabric, probably with some sheen and wrinkle-resistant ability, makes dressier chinos, while rougher, heavier twill makes their casual counterparts.
Second is detailing. Dressier chinos usually don't have coin pockets or feature very discreet ones, and have nicer buttons (corozo or wooden-looking plastic.) Some casual chinos, on the other hand, either as a result of cost-cutting methods or by design, have tacky plastic buttons and not-so-gracefully placed coin pockets (or sometimes, none at all.)
Third is fit. The fit of dressy chinos is more precise than that of casual ones, with closer-fitting waist and a perfect inseam leaving little to no break. Casual chinos have a more comfortable fit and perhaps a more liberal inseam that you can cuff up for a casual look. But whichever you are getting, you must go for a fit that looks flattering on you.
Last is construction. Dressy chinos have full-curtain waistbands that help you tuck in your shirt nicely, and single-needle/hidden stitching along the inside legs. Casual chinos usually do without these.
Of course, it's you who will decide how to tailor your chinos to your liking. You may want a pair of casual chinos with thicker fabric but with all the features of dressy chinos. The best pair of chinos, in my opinion, is a versatile one that serves you well on all occasion, nice and proper without being boring, having texture and character without being ratty.