Like the title indicates, I've lost 20lbs and have already had 4 of my jackets altered. But something is missing. I want to buy some new Jackets off of eBay. I was 40R but now dunno -- maybe 38R? 36R? Question is: how do I take correct measurements in order to buy Jackets/Shirts/slacks off of eBay? TIA! FYI -- I'm 170lbs; 5'11.7"