How do professional women dress in Houston?

I know this seems like a frivilous question but HELP> I’m interviewing with the Houston branch of a software company and I live in casual, hot Phx where summer dress – except for some interviews – is casual. Houston is new to me and I don’t want to blow it – these will be internal customers and subordinates if I’m successful. Any tips?

I was going with the tank shell/black pantsuit/strappy sandals/hot bag look that is Phx standard.

Thanks in advance for the opinions and, if I get the job, we can do world hunger or the oil crisis next!