Sense of Style for a 18 month old?

Online today, I found a headline that said "Twins share SJP's sense of Style." The article went on to describe Sarah Jessica Parker's life, including her twin daughters.  What caught my attention was that the article claimed an 18 month old child had a sense of style!

Now, I understand that children develop personality.  But how does an 18 month old who is trying to master language and life skills develop a sense of personal style?  I'd guess her selections are made from a very small pool of things: namely what her parents buy her.  She may have preferences within those parameters, but that is not developing a sense of style.  That is mirroring what Mom's sense of style is.  At some point these children will have preferences and ideas that expand from Mom's selections.  But right now, they aren't even out of diapers and they certainly are not perusing diaper catalogs for the latest styles.