Track suits or warm ups are usually made of a polyester material, made to keep you cool or warm depending on what the person is doing. Sweat suits, like that Juciy one, are ususally made from cotton or velor.
This is a Japanese pop group - Heartsdales, with their latest single "Stay"
I dress like this once a week when I hit the gym
If you have a local Sports Authority or similar store, you can assemble the shoes ($40.00), pants ($40.00) and jacket ($60.00) and visor or cap ($25.00) in one fell swoop. Might cost you less than what I mention.. I'm just going off the top of my head