An ethical dilemma...

The scene: a major national department store, where you can buy everything from lingerie to gardening tools.
I was there yesterday to stock up on exciting essentials like deodorant, soap, shampoo and the like.

I spotted a really cute coat that's everything I've been looking for this season, and, at $69.99, it's $50-100 cheaper than similar coats I've been eyeing in the catalogues I get. I hadn't really budgeted for it, but experience tells me that when you see something like this, you'd better buy it... because it probably won't be there the next time you set foot in the store. So I decide to cut other items from my shopping list to make room for it. Cool.

When I got to the cash register, I opted not to put the Fabulous New Coat on the grody conveyer belt, because, well, it's my FNC, and I don't need any leaking food or motor oil getting on it. But I started to hand it to the cashier, and she motioned for me to put it back down in my cart.... indicating she'd scan it last. I go to swipe my card, and when the total comes up, it's wrong. She hadn't charged me for the coat. I point this out, hand the coat to her again, and she scans it. I have to swipe my card again, for some reason...so I did that, then started fishing around for my keys and stopped paying attention to the transaction.

It wasn't until I got into my car and checked the receipt -- to make sure I hadn't been charged twice, since I swiped twice -- that I realize that I still hadn't been charged for the coat.

Here is my question: should I have gone back in to ask them -- for a third time -- to charge me for the coat? Am I now a shoplifter? Have I just invited some bad karma into my life?

What would you have done?