Most commercial air-conditioning systems are dated, as they are often designed for a different time, and for worst-case scenarios. After years of slowly raising the thermostat, my office is now cooled to a clement 74 degrees, and a light blazer will normally keep me sufficiently warm (and productive).
The Open-Front Sweater-Blazer, which I’ve featured several times before, is perfect for transitional weather and is also suitable for less aggressively air-conditioned offices. I own three of them, and always keep one on hand should I ever find myself starting to freeze.
This reliable (and versatile!) sweater blazer is now on a moderate sale in four colors online, and is an extra 50% off with code BIGGESTSALE. (Only petite sizes are on sale.)