hiddenflame;
Where are you traveling to? Is it in-country, or international?
If it's within the U.S., the TSA agents have already seen it all. They're looking for bombs, not bras.
If it's checked baggage, mixed-sex clothing in the same bag won't even raise an eyebrow if a human has to open it to check the contents. The computer on the x-ray tunnel found something and they have to find THAT. If they find breast forms, big deal. there are a lot more women with double mastectomies than there are crossdressers. Again, no eyebrows will be raised.
I've gotten 'secondaried' for the same kind of tools Laura pictured for us (though, I only take the one I'm using and the next size smaller (just in case) on trips.) What got me in trouble was the metal tube of Surgilube, which broke two rules (over 3 oz of liquid, and not in clear plastic.)
Once the TSA agent identified that it was NOT potentially a bomb, I was on my way. They did NOT make a big deal of it. I got the impression they see this sort of thing on a regular basis.
So, if that's not a big deal, the 'wrong' clothes are probably not, either. If you're going to a country where they might be, then they're your wife's.
Karen
P.S., under no circumstances while traveling refer to a bra as a 'booby-trap.'