I have not made a specific wardrobe request of those who have done the smothering, other than the smothering work or succeed! I would probably request panties, I think!

It seems to me as if, usually the smothering or facesitting should lead to other forms of worship or humiliation or abuse. However, it does not have to be that way for the first 2 or 3 visits, but the domme should see if she can use the smothering and facesitting to her advantage . . . to see how the guy will go in other directions, also, if any!
It seems as if, if a guy is highly attached to facesitting or smothering, you should see if he will do it while restrained . . . and see what humiliation you can give him, within the constraints of domme ethics, which might include some trickery or deceit, depending on the context.

Oh, I have watched a dozen videos of smothering that put a guy out.

If the domme does not use the facesitting, queening or smothering to lead to something else worse or more difficult, then, I would feel bad if she does not use smothering to put a guy out!

Do you put many of your subs out when smothering, or any, or is that a risky thing, even though it is in various videos, all over the place?

Have you or how have you used queening and smothering to lead a guy sub into other things, if at all?