I ordered a couple of dresses from their retro section, one dress fit perfectly but the other (which had buttons from collar to under bust) did not fit me across the chest, there was no give in the fabric and I couldn't get the buttons done up.
BUT in saying that, I called their hotline straight away and asked if I could send it back or get a large size to accommodate my bust, the woman I spoke to was an absolute darling and she offered me a full refund on the dress but insisted I didn't need to send it back and suggested I instead gift it to a friend! They didn't have any larger sizes in stock, that's the only reason I didnt change it over.
Seriously best customer service I've experienced in a long time. AND the dresses I bought are cute as hell and of great quality. They may take a long time to be received but I've found it worth the wait.
Would recommend zulily to friends, family and definitely return to shop.
I'm currently waiting on a pair of boots and a couple of new outfits.