I don’t know about your workplace, but my office is chilly even in the heat waves this summer!
Most people in my office keep a sweater, jacket, or, I kid you not, blankets at their desks! I have this lightweight jacket that looks like a knit pea coat that I got at Target for about $20 several years ago. It’s a great little jacket that I can throw in an overnight bag or hang from the back of my chair and not worry about it.