The same reason why ballerina may wear tights is so everyone looks the same along with the teacher being able to make sure all muscles are engaged. It also creates an easier way of movement.
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Ballerinas wear tights so that they simply all look the same. They all get the same color tights. So the imperfections of their legs don't show. Tights have a classical look to them. Something has to absorb the perspiration from the lower half of their body and make their legs look good. Socks and long underwear are too thick and not as fashionable. Besides, it's not just ballerinas. The male dancers wear them, too.
im pretty sure its the tights
what do ballets ware? seriously? I'm just assuming that you mean ballerinas and wear. Ballerina's usually wear a black leotard, pink tights, hair in a bun, and a skirt (optional)
male ballerinas are called danseurs.
Mikhail Baryshniko, a male ballet dancer wears tights.