I ordered a cute tank top in the plus size shop. The sizing guidelines indicated that a 4X was a size 26/28 - which is in keeping with traditional Plus Size clothing, so I ordered from Zulily for the first time.
When it arrived it was barely a misses size Large. The printed tag said "4X", but it was FAAAARRRR from it. I will never try to buy from Zulily again. It was a big disappointment.
They did refund my money and did not require me to return the super-duper small tank top, so that was nice because I hate the hassle.