I always wear a suit for an interview or chat for a potential job. Whether that be a knee length skirt and jacket (not too fitted) or a trouser suit. If it's hot I take the jacket off and put it on the back of the chair. I personally wouldn't wear cropped trousers as I don't think it is smart enough - sorry if that isn't what you wanted to hear, just being honest. Perhaps you could wear a trouser suit with a cotton blouse and then take your jacket off if it's hot? Hopefully it won't last too long and you never know, there might even be air con or a fan on if you're lucky.

I hope it goes well for you.