To begin, I love wildfox. I think their designs are so cute and wearable however their prices are quite ridiculous.
I found this dupe of the wildfox smiley face sweater.
The quality is very nice and it only cost a total of AU$11.85 (including shipping). The material is somewhat thin, however really soft.
If you are interested, I found it here: http://www.ebay.com.au/itm/280817216906?var=580069181556&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_6551wt_905
It comes in one size and I would say it would fit anyone ranging from a size 6-14 (AU). If you are not within this range you could always wear it a little higher with something underneath.