Hi, I need some help here. I'm planning to buy a Chanel Boy in medium in navy caviar but I am confuse on what size to get, the old medium or the new medium. My husband initially got me the new medium as surprise present but we found it a tad too big. I'm planning to exchange it for the old medium but the Chanel SA told me that new medium suits me better. Pls help! I'm 5'3 118lbs.