I walked into the public mall wearing boxers only
Why was that the only thing that you were wearing?
It was too hot to wear anything else.
You should wear some shorts at least for the next trip. It is not okay to walk around with just your boxers on!
I don't think it's appropriate to walk around in a dress either, there's nothing wrong with my choice.
You could get into trouble for it, since you are only wearing your underwear. You should wear more clothing when you are going out in the public.