How I Met Your Mother, Season 6

Barney:
It's a sad day in New York, Ted, a sad day indeed. You know what I saw on my way in here? A girl in a sweater. And you know what that means: the season of exposed skin is over, exactly! Gone are the tank-tops, Ted. Gone are the cute little skirts. Gone are the sundresses - the sundresses, Ted! I don't think I can make it another eight months with no sundresses.

Ted:
Barney, I really - I have to grade these papers.

Barney:
I'm sorry, I'll let you work... But first, a riddle. What piece of women's attire, most stokes a man's desire?

Ted:
A sundress.

Barney:
Correct! What lightweight outfit, pink or white, makes the front of my slacks abnormally tight?

Ted:
I really have to get this done.

Barney:
Of course, of course. [pause] Sundress, by the way.