Bench. Cardigan

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Hi...I have pRobLem with one of my purchase and I need from your help, please? :)
Can you tell me for Bench. Cardigan sizing???
I bought this item: 
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=150591302629&var=450023043637&ssPageName=STRK:MEWNX:IT#ht_3204wt_1276
...but it's so large for me...my size is 'S' ... this Cardigan is size 'S', but it  is veeery verryyy bigger :)
Please help me and tell me what I must to do in this moment! 
Thanks :)
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