Leave the curtain open, but not completely, so to have plausible deniability whilst still letting the men see inside.
Then, I'd go for her parading around for at least 30 seconds.
The reason is that if I left the curtains fully open, or I opened them myself, she would get angry with me for having exposed her without telling her first. If instead it happened "by mistake", then she would brush it off as "oh, it happened by accident, I didn't do it on purpose", whilst still being excited by the show she would have given.
