Business casual?

Tomorrow is my first day at my new job. It is also orientation day at Azusa. So the question of the day is : what to wear? More than likely jeans are not a good idea. You have to be explicitly told they are okay before you don them at the office. So, a skirt then? But if I wear a skirt do I have to wear nylons? I hate nylons. I don't think I even own any. When I worked at Sears I just wore tights. But it is too stinking hot to wear tights this time of year in Southern California. That poses another problem: do I wear a blazer? Will I get too hot? Normally I always have a cardigan sweater but I no longer own any that are appropriate for a professional setting. And then there's this orientation issue. I have to drive directly from Los Alamitos to Azusa (I'm guaranteed to be late) so my outfit needs to be flexible for both environments. I won't have time to go home to change, let alone eat dinner. Oh, what to wear?! Who wants to come over and pick out my clothes?