What you need to wear for ballet is very simple. In ballet, you need to wear pink tights and a leotard. Mainly, you always wear pink tights, but you could wear different color leotards. Sometimes you'll wear a pink leotard, a black one, or a different color one. For leotards, that all depends on what studio you go to. Other than the color of your leotard, everything else is simple. You need you hair in a bun slicked back, wear your pink tights underneath the leotard, and your ballet shoes on top of you tights. Ballet has very simple clothes, and they're easy to get at any dance store.
Hip Hop has the easiest dance wear. For hip hop, you can wear anything. Usually, you would just wear everyday clothing. All you need to wear for hip hop is a shirt, shorts, sweatpants, a sweatshirt, and sneakers. It's mainly recommended to at least put your hair in a ponytail, but if you want, you can just leave it down. Hip hop needs very simple clothing.
For Jazz or Lyrical, you can choose between two different types of clothing. You can wear a two piece (which is when you wear a dance top and shorts), or you can wear a leotard. It's Your choice if you choose to wear either one. There isn't a specific uniform/clothing that you need to wear for jazz or lyrical, however, a two piece or leotard is the most recommended and the best clothing to wear.