Here’s what consumers have asked with answers from Zulily staff and previous consumers.
I know that Zulily deals with many different companies so some may be from overseas but not sure. You realize that the reason the items are priced so well and that the stock changes often is because they do get from all over.
I don't think they are based in China. They are a company that offers other folks' products on their website, so some of the items may be made in China. I suggest always checking the size charts, looking at the descriptions (some say the article runs large or small), and reviews of the item if there are any.