do i need?

do i need this? i think i may... plus... truman would just love it!

http://www.forever21.com/Product/Product.aspx?BR=f21&Category=sale&ProductID=2000034370&VariantID=

not too expensive either! i just get hesitant about buying online because i never know if it'll fit! and then when it doesn't, i get super aggrivated! grrr.