Smart Casual for a Job Interview

I am scheduled for a Job Interview on Saturday.  The dress code is smart casual.  I am not sure what to wear.  To be honest, I don't want to spend money on clothes.  I have loads in my closet but I don't know what still fits since I put on that dreaded 20 lbs!  Please help darlings.

These are what I have in mind.

Photos from google images.