If they were very sensitive, the constant friction of a shirt would be a lot worse than possibly snagging them on things, since the most likely thing to snag on /that/ close to your own body is ..well, your clothing.

[Even that small, Knives is a good analyst. He twists a little, carefully spreading one wing; it's not exactly /easy/, it doesn't really want to respond, but eventually it does.]

Nor are they really large enough to bump into things when folded, unless people make it a habit to back into things, but if they do that the shirt won't be much help anyway. What's a 'teleporter'? I know what it sounds like but that's science fiction isn't it?

[He's also good at changing subjects at random, but keeping up with the answers seems considerably easier. Doubt creeps back in when Vash claims to be over a century.]

Are you sure?