The ladies will have a laugh. The guys can laugh as well. You know you have been in this situation before. My wife asked for some workout pants. So while I was on a trip to the USA (she often gives me shopping lists), I stopped into Dick's Sporting Goods. I found the Adidas pants that she would want. But of course I have no idea what size. I located another woman in the store that I sized up as being about the same size as my wife. I asked her. She was very helpful. The pants fit my wife perfectly. Now I have a more difficult problem. She wants some yoga pants (yaba daba doo!). Ok, well do I just wander around in the ladies yoga pants department until I can find a women that is about the same size? I can just picture the situation. "Excuse me! Can you help me? Your booty is about the same as my wife's booty. What size yoga pants would you buy?". I might look a little silly. So ladies would you think I was trying to score or something? Honestly I just need help shopping. Edit: My wife is Asian. We live in Singapore. USA sizes are not the same. What you call a medium might be XXL to her.