No likey.

To each their own, but I personally don't understand the look and it doesn't seem comfortable. 

Maybe she really likes her new sandals and wanted to make sure every detail was

shown so she buckled them over her jeans. 

I snuck a photo of a girl I saw standing on the EL plantform while waiting for the train home from work the other day:

And while we are on the topic of sandals, I highly suggest that you avoid buying any sandals from Forever 21.  While I'm a big fan of that store in every other regard, it is not a go-to store for sandals.  I've been a victim of several pairs breaking on me while walking down the street or accidently kicking the leg of a chair. 

It's pretty inconvenient, not to mention a waste of money.