Sometimes a man attends a wedding, funeral, job interview or work in a formal environment where he's expected to be in a suit. In these environments, one is probably going to default to a conservative blue or grey worsted, possibly with stripes depending on the occasion. There are times when only a conservative suit will do. Outside of these formal environments and in places where an odd jacket and tie would not only be acceptable but possibly on the upper end of what is being worn, one has more options. In addition to an odd jacket and trousers, one could wear a suit made in a more casual fabric or in a color or pattern that makes it more casual. Examples would be seersucker, tan linen, houndstooth flannel, POW check, etc. Assume you're not in an environment that requires a suit but allows a more casual one on Fridays. If you could choose, either for a particular event or for your daily wardrobe, between an odd jacket and trousers and a casual suit, which would you turn to and why? Assume a tie is being worn either way.