This a two part sweater: from the back it looks like two layers - one longer then the other, and from the front it looks like tu are wearing a strapless parte superior, arriba and a sweater on parte superior, arriba of it . link
foto
sweater
parte superior, arriba
This Teen Fashion foto contains
cárdigan and chaqueta de punto.
There might also be
jersey, slipover, suéter, suéter, puente, and jersey.