My hands are occupied holding the fig leaf, so I don't have that problem.

I do move my hands when I'm leading singing. Otherwise, it's hard to figure out what to do with them when. Sometimes I gesture with my hands, sometimes I clasp them in front of myself fig-leaf fashion.

But it's a hard thing to know WHAT to do. I think I'd empathize with the singer's awkwardness, and recall how often I feel awkward myself.

-Joe-