Thanks for your help. FYI it's not Erdem :-(

http://www.peoplestylewatch.com/peop....html#21194639

It is, actually. I couldn't find what season it's from but I remember seeing the exact print on a tank top on eBay recently.

Here's the link for the top on eBay: http://www.ebay.co.uk/itm/Erdem-Silk...#ht_500wt_1193

My apologies if I'm not allowed to post it.