Now, as to your question about panties under the leotard. The answer is a big fat NO. Leotards are NOT meant to have panties worn under them. Pantie lines are especially GAUCHE and out of place in ballet class. Why do you think thongs were pioneered by leotard wearers? (The first thong I ever saw was in a dance supply shop in 1983--"Fan-E-Pants"--this was long before thongs caught on with the general public).
No, I'm sorry, you will need to find other venues for your pantie thrills, outside ballet class. If panties under the leotard are unacceptable for women dancers, that goes as well for men too!
P.S. Don't forget your dance belt.[/i]