Oh clever resourceful MNers...... I need your help.
I really really rilllly want this for Saturday night (very special occasion). I fitted on the medium in the Zara closest to Marble Arch, but was too big. They didn't have a small. I didn't see it at all in the Bond St store. Thought I'd just order online, but now that I'm home I've checked and it's not available. 
I can't go to the shops tomorrow as I'm home from work, but can have another hunt on Thursday. I fear time is not on my side!
So. Has anyone seen it in the last day or so? Can anyone advise if Zara are helpful in tracking down an item for you?
Thanks!