Sweatpants- which one?

I have dance lessons to take and they want me to have sweatpants. But I don't know which one to choose. There's sweatpants that are like tight on the ankle, and there are ones that look like normal pants but the same material as the ones tight on the ankles. In my opinion, I thought the ones tight on the ankle are best suited for dance since they won't flap around, but I'm not sure.