I've ordered from zulily for the past three years. In the past I bought one thing here and there. Never really happy but the items were okay. Recently I have been ordering clothes. They have a size chart with every item. The chart is usually, in my experience, totally off. Everything I have purchased for myself has been either too small or too big. I also decided, recently, to purchase clothes for my girls. While I have had very little luck with shoes for the girls, I've had about 50% good luck with clothes for them. I'd say many of the outfits that are inexpensive (like the little sets that are only 9.99 or so) are dollar store quality... maybe even what the dollar store sells... I've ordered a few more expensive, like $20+, outfits and the sizing was off.
I also purchased a bag/purse and it came with a price tag on it. I paid a dollar less than the tag. Which, the site clearly states that the "strike through" price is not any actual reflection of the actual cost (basically).
I've had okay customer service, two times when I've called the girls were helpful and nice. They refunded my account for the items that were either defective or completely sized wrong. I placed about 8 orders over a period of two weeks. I wouldn't recommend buying clothing... and also, Google the item before purchasing it from zulily. I've found many times... that zulily is not a bargain.
Oh, the two girls that refunded me for my items said to just donate them to someone in need. They were great. I called yesterday and complained again and the lady was short and I have yet to see a reflection of any return for the items.