I always used to wonder why everyone claps and cheers when a dance line does the classic "Can Can Kick". I asked a lot of people why people cheer, the standard answer was, "because it's a hard thing to get right". I didn't really accept that answer, because well, I rarely saw any dancers mess it up.
In high school drama (yeah, I was a drama dork), we studied choreography. My drama teacher was a professional choreographer, so I asked her about it. I also included the standard answer I'd gotten from everyone else.
She started laughing and said that's what she always heard too. She went on to add... everyone cheers now more out of tradition than anything else, but originally the men cheered because the dancers were showing their legs, underwear, and in the dance halls of the old west... a lot more than that! ;~D
Glad you get to wear the dresses you like better! Hope you get the pic and link fixed!