I clicked both. In fact, today I'll have worn cycling-specific clothing on the way in, which involved a 20 mile detour with 2x20' intervals thrown in, and my regular office clothes on the way home, as I ride directly home and spin easy. During the spring and summer when the local group rides are going in the evenings, I'll often do the opposite: easy ride directly to work in office clothes, and hard ride in the full kit after.