I've always been able to get away with wearing the lightest coat in the dead of Winter because I was always too warm. Had to sleep with a fan on at night to try and stay cool. Kept my office as cold as possible with a fan.
Now, I wear a sweater in the office, slippers at home, never have the fan on and actually have to zip up my jacket! I'm not quite halfway to my goal weight. I will probably end up walking around clutching a heater by the end but it will still be worth it!