Haha, trust me I know all too well that it doesn't hide anything. I know not tucking in your shirt isn't the best option. But it looks casual. Or maybe I am wrong.
Cargos I don't wear. It's either shorts, jeans, chinos or trousers. (In order from informal to formal) What do you think about wearing a Henley or a solid V-neck t-shirt with chinos?
I agree to that. I have three pairs of oxfords, ranging from a designed (I don't know what to call it), crocodile leather and a patent leather shoe because I knows they are important. But judging from the informative answers you've given, I am guessing I don't think I can imagine how important they are.
I am not too big on sneakers, but what about in clubs? I always thought it was a norm of some sort.