Originally Posted by fuzz2050

It depends on what business casual means at your company, the length of your commute and your expected weather.

If you have a short commute (less than 5 miles, although closer to three is ideal) then just wear whatever you want. I've put in a surprising number of miles on a suit (it's mainly surprising because I don't wear a suit all that often). For those distances, it doesn't really matter what you wear. If it rains, you can get a little wet. Long underwear underneath light weight wool dress pants will be warm and comfortable even when wet.

If you have a longer commute (I think ten miles or so is the cut-off for me) then just wear something good to bike in and carry business casual clothes.