What does dress sexy mean?

My boyfriend has asked me to wear something sexy the next time we go out. When we sleep together for the first time and surprise him. I don’t have many sexy summer clothes. What I do have are a long, flowy lilac dress with lace at its bottom, that needs to be ironed, a modest but pretty blue and white linen sundress, or a forest green lace dress with puff sleeves. I’ll be wearing lipstick and mascara. Some nice jewellery. Pink nail polish. Which dress should I wear? It’ll be a warm day, but not too hot.

What does dress sexy mean?
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