When I did a bike trip in cool weather earlier this fall, I wore cycle specific clothing next to my skin, but the jacket and sweat pants I used were not cycle specific. When I bought them, I had paid attention to the arm length, leg length and overall fit to ensure they'd work on the bike. This turned out to be a good combination.
Before I made the switch to clipless pedals and cycle-specific shoes, I would carefully buy shoes that would work on the bike. I looked for a comfortable fit and firm soles.