All the suggestions are good - I still get cold 2+ years after BC chemo. I wrap up in a lap quilt to watch TV in the SUMMER for goodness sakes! unless the temp is above 80. I get occasional WARM flashes, but not often enough to keep me warm - my hands and feet are ALWAYS cold.
One thing not mentioned so far - small pillows - about 7" x 12" to protect the mastectomy area from seat belts. I walked around the house with mine under my arm to remind myself to NOT raise my arm for however long (I've forgotten the exact time) I was not supposed to raise it.