Zara mini dress

There is a SUPER cute linen and viscose backless criss cross dress that does not fit me (I'm usually an M in most Zara clothing). It's never been worn out. I only tried on a couple of times, hoping to make it work for me, but nope. I'd say this is a true size L with wiggle room as the straps can be pulled tighter or looser. Someone else needs to rock this dress!