I have used Farfetch a couple of times and it was OK. My last order was a leather jacket which, unfortunately, was small sized. I requested a return, sent the jacket back, it was delivered to Farfetch and signed on March 5. Since then I haven't got neithet a reply from the Farfetch team about receiving my return , nor the refund.
Think twice if you decide to place an order with Farfetch.