Aerial Hoop or Lyra comes in several different forms; single and double point (referring to the attachment points at the top of the hoop) but also spinning and non-spinning. Some people are drawn like a moth to a flame to the simplicity of the big round O of this perfect circle of metal. Some are drawn to the spinning element.
Like all the other aerial disciplines you will need upper body strength, a head for heights and a high level of flexibility to show the tricks off to their best.
Full length but close fitting leggings preferably with no zips (some people like to wear two layers), a long sleeved top with possibly a leotard underneath will all help to protect your skin while you train.