Nordstrom does allow people to return used items, but usually you must have the receipt or tags attached. However, whether you should return it is another issue. Personally, I have an issue with people returning used items. It's one thing if there is a defect, like if the zipper broke, but because it isn't the right proportion for you? That's something you should have determined before snipping all the tags off.
I am very much the shopaholic, and I am personally guilty of returning unworn items in my closet after some bit of time to Nordstrom - like 6 months or even a year, but that's fully within their policy and the items are always unworn and unused. If it's been worn, then I'm stuck with it.
I know, I have only returned items probably less than 10 times but those were stuff that I haven't used yet and decided it was not right for me. I would actually prefer to shop in a store that had stricter return policies so at least there's little chance that what im buying was used by other people.