Slimming Mirrors in Retail

The following was sent to me by a friend, and got me thinking…

We were in the mall last night (specifically in The Limited). While I was waiting for her to try something on, I was sitting on a bench near a mirror. Another lady walks up to the mirror, looks at herself, then turns and says to her daughter "These are the mirrors that make you look skinny." My initial reaction was this woman was fairly crazy, because she was already pretty thin….but then I realized how ingenious the idea is, and figured she is probably right. Why not make all of your mirrors make people look better in your clothing, since they will be more willing to buy the clothing if they think it makes them look skinnier. I wonder how widespread this is. Is it done only in women's clothing stores, or would it be done for men also?

I wonder now if this is true or a retail urban legend. Have any of you worked in a retail position such that you can verify or refute this?