[user104658]

BH if you're going to say anything regarding weight you might as well just say fat. No one is going to be LESS offended by being called "the larger lady" than "the fat lady"... I mean... unless they're not the brightest - they know what you mean. Either don't mention physical attributes at all, or just go with it .

Of course the ACTUAL polite thing to do, would be to introduce yourself to people and learn their name in the first place and then remember it.