I have come to appreciate the convenience of wearing most of my work outfit while on the bike. Generally, my dress shirt gets stuffed in my bag, and my pants/baselayer/shoes are on the bike. It keeps my backpack lighter (i.e, not full of clothing).

If it's raining, snowing, or even slightly slushy, I have to wear the rain gear, but on nice days it's cool to wear your work pants on the bike! If I were wearing slacks, I would not be comfortable (given how fast I like to ride), but the Zion's are good stuff.