A young man wearing a hoodie, pants, and athletic shoes is sitting on a red lounge chair and watching hi-def tv.
Man in relaxed clothing lounging in a chair watching tv
The man is relaxed and lounging because he is wearing a hoodie and sitting in a lounge chair.
Young man is a man, and hoodie, pants, and athletic shoes implies relaxed clothing.
A hoodie, pants and athletic shoes are a type of relaxed clothing, and "lounging in a chair" is a rephrasing of "sitting on a chair".