I can get away with using a light vest, like shown, only if I have 3 good quality layers below. I'm using a wicking base layer, a Merino wool middle layer and a breathable top layer. I then will add the vest if I need wind protection beyond these breathable layers.

I have the common issue of a heated core that triggers sweat production, but a chilled skin that is below normal body temperature.

I want my under-arms to breathe and shed moisture, so the vest works well. However, I need the other layers to hold heat while filtering out perspiration.