Only you can tell if it's a benefit for you, but I would say most of that stuff is mainly to impress other cyclist. I live in Atlanta where it's quite hot and humid in the summer, so in the summer I tend to wear biking shorts and a jersey because I can't bike naked (stupid public indecency laws). In the fall winter and spring I just wear ordinary clothes for the most part, in fall and spring shorts & a t-shirt, in winter wool trousers and a light sweater.