If I had one then I'd probably only wear it when I was decorating the house or something, but I'd be more inclined to pick the free wipes in terms of their usefulness.
I have one, and after a little t-shirt hacking I plan on wearing pretty much anywhere. =^.^=
(it sort of doesn't fit my boobs without them attempting murder of the screenprinting so I plan on slicing down the back and adding a little fabric, some eyelets, and a pretty ribbon to turn it into a lace up)
My girlfriend has a couple, she wears them out every so often. We find it very entertaining and fun, mainly because no one really notices it at all, so don't be so chicken-shit about it. Wear it out, have some fun, and enjoy a fun visible secret between you and your partner. And should someone ask about it, have fun with that too.
i have two, a fitted, size Small for wearing out, which i modified by cutting off the neck and sleeves to make it sexier, and an XXXL which is super soft, to sleep in.