If it ends up being only 2 miles, clothes are a total non-issue. Just wear your office clothes on the bike. It's a short enough distance that you can ride below sweat-threshold speed and still get there in very little time. At that distance, the time spent changing in and out of clothes is greater than the time you would gain by riding any faster. Either way it wouldn't count much as "exercise" because even if you were going balls out, it would take less than 8 minutes, which would be barely long enough for your heart to even notice that you started working. 5 miles, however, is more like "real exercise", and then you'll probably prefer changing clothes. Like others, I keep jeans/shoes in the office, but to keep up with the it's-gross-to-wear-the-same-outfit-every-day culture, will usually bring in a different shirt every day I ride. Over time I've figured out which shirts get more wrinkly and how to fold/roll them in the least-wrinkle-inducing ways.