Cycling clothing is built for performance. Shorts are tight because they are designed to move with you rather than chafing as you pedal. I don't see a problem, but if this bothers you, you can either opt for mountain biking shorts or alternately, throw a pair of loose fitting gym shorts over your tight fitting bike shorts. Jerseys are cut more form fitting than a loose t shirt so they don't flap in the breeze, and with back pockets to keep your stuff out of the way as you pedal. And front zippers so you can get some relief on hot days. But you can find jerseys that are a little more relaxed fitting if you are a little heavier or feel a bit self conscious. You may also need to check the sizing as some brands idea of XL or XXL might not be your idea of those sizes..