TV/CD means tranvestite / cross-dresser. I have used tv/cd as a key word for certain lingerie. Drag is kind of different, to my mind, for though it can mean simply cross-dressing, it really brings drag queens to mind, which is another ball game.
I think there are also particular fetishisms, as has been suggested, for instance I've seen sissy used as KW. My knowlege is hazy and I'm happy to keep it that way. I don't mind what any consenting adults get up to, but I don't necessarily want to know the details. I hope I'm being appropriate to this forum with this kind of info. I'm very matter-of-fact about these kind of subjects - and I'm pretty unshockable really.
On the other hand, these knickers would also be great for a female burlesque performer, or any woman who has that kind of style. Personally when I sell vintage lingerie that I think might also appeal to cd men, or to fetishists, I will use appropriate keywords as tags, but otherwise don't make any particular point of it in the listing.