Allowing women to be the arbiters of modesty is like allowing a mouse to guard a room full of cheese. It's in women's (fallen) nature to want to show off and be attractive. It's insane to think women can self-regulate this area. Another failure of feminization.
Actually in following the advice of good traditional priests whom I respect.
Ballet originated in the 15th century courts of the Italian renaissance. You may as well say a lot of classical art and classical literature is ‘immodest’
This is definitely an American trad Catholic viewpoint … virtually no trad Catholics here in UK are against dancing. The FSSP and SSPX even put on dances for young people of opposite sex to meet each other. A friend whose daughter attended St Michael’s SSPX school in uk is training to become a professional dancer (ballet).