Don't understand why - but the size on this item was not consistent with the exact same size on the exact same product that I bought the day before at Nordstroms (in store, not online).  The product number, size, etc. were exactly the same, but the bra I bought online was slightly smaller/tighter.  I'm keeping it and hoping the elastic will relax some, but don't understand why it didn't have the same fit?  Wacoal overall are excellent and comfortable, and the item shipped amazingly fast - was delivered one day after I ordered on Amazon prime.