Casual wear are clothing that is not formal and have a more relaxed fit. Unlike a suit, it's less standardized, allowing for more self expression. Whatever style you choose, it's important the fit and features of your apparel are done right. Fight the urge for pure comfort at the expense of style; appearance matters and it's hard to take a man seriously if he is wearing what looks like sleepwear in public.
Follow the guidelines provided and you will find the right balance of style and comfort.