How to tell a woman you can see up her dress?

In a work environment, how would you tell a woman that when she sits down in the presentation room, that you can see up her skirt.

In this current age of sexual harassment, I choose to move seats rather that say anything that could turn into a complaint. I started to tell her in private, but just decided that it wasn't worth the risk.

Anyone have a different way of handling this?
Enjoy the show
Point it out to others
Avoid looking / Move seats
Tell her
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Thankfully the next day she wore pants. :)
How to tell a woman you can see up her dress?
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