OP, how long is your commute? If it's short, like 30 minutes, I wouldn't bother with the tights. Just regular clothing. Don't want to shower? Don't push too hard so you don't sweat. That's tough to do in the summer, I know, but the rest of the year is quite doable.

If your commute is longer, like an hour or more, then bike specific stuff is best. If you lollygag there it'll take way too long. If you push, you will sweat. You choose the lesser of the evils.