Too big? Too small?

Cardigan: £34.00 republic

Hey Lovelys, another quick post. I got this cardigan online from republic in a size 10 and cant decider weather it is too big for me or not, i have rolled the sleeves up once because they were mega long *mega* and i have long arms! I do love it and it is nice and snuggley but i feel i have no shape in it, is oversize knitwear in this season? I don't know, i just feel frumpy today *hump* i might get the size 8 to and compare I'm so indecisive.
How was every ones Monday?