What tops are appropriate for a smart casual spring work placement?

The dress code is smart casual. You need to wear trousers, which I’ve got, but I don’t know about the top half. It’ll be spring by then and spring is quite hot here. Should I buy some short sleeved blouses, or button down shirts? I have a feeling that t shirts won’t do the job.

What tops are appropriate for a smart casual spring work placement?
Post Opinion