Where can I find those long skinny hoodies?

My professor (Who I swear looked way younger than any of us in class) had these really cute hoodies that were long (they went to her shin) and skinny (fitted). Then I saw them worn in a korean drama. Where in the USA or online could I buy one? Do they have a specific name other than hoodie? I don't like the short and baggy hoodies that stores have to offer. Please and thank you :D