Friend, I'm in the same situation as you are. Since birth, my family and I have always lived in extremely hot places, and I have never needed pants. However, I am in need of a job soon, and I think it would be unprofessional to wear boxers/shorts to work.

I decided to go to a clothing store, and look in the pants section. After about an hour, I finally grabbed a pair and went to the changing rooms. When I got a stall, I had no god damn idea how to wear them. I just sat in the stall for 10 minutes and awkwardly chuckled to the lady standing outside, "Oh, they were too big on me.". Worse day of my life.