Sexy

You don't want to antagonize her too much. You think that the outfit you choose is perfect for this occasion, and judging by her smile, she thinks the same.

"Thank you" she says "I was afraid that you will...nevermind. Why don't you try what I chose for you?"

Her preposition is a little more daring that yours, but not too much. It is a black knee-length sleeveless dress. It let's you show off your figure, but it also covers you to your neck. It's sexy, but definitely not slutty, maybe a little flirty. You are relieved.