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 আপনি are wearing a strapless শীর্ষ and a sweater on শীর্ষ of it . link
ছবি
sweater
শীর্ষ
This Teen Fashion ছবি contains
পশমী গেঁজী.
There might also be
পুলোভার, slipover, সোয়েটার, and জাম্পার.