Odd example of False Advertisment?

So, last night is was extremely tempted to buy false advertisement, and I am riddled with guilt for it.

So, I went shopping in Kmart of certain school objects, such as pens, notebooks, and a new bra. Since my white one is almost dead I deiced to go for white-- you can't usually find mind-blowing cool bras at Kmart. (I can't anyways.) So, it was down to the only two I picked up, but one made me look an entire cup size bigger. It was beyond awesome. (In case you don't know, I have small boobs, so this is a good thing.)

I was so very tempted to buy it -- it teased and taunted me mercilessly -- but I deiced against it, because it is after all, a form of false advertisement, which I really don't like.

So, with this guilt gnawing on my brain I began to think, when do I start to classify things as false? I will admit that most of my bras give a little push, but nothing crazy. I think it is just a small fib, since it isn't drastic, but would other people call that false? (Although, only a few will realize this if I don't tell them, and if they find out on there own, it better be an after-thought because they have superior things on there mind. ;)

Where do people draw the line for that type of stuff? Not just boobs, but everything in general?

Sorry for my awkward example. Well... it's not awkward for me. Perhaps only you?