From my experience..

The best way to spot fake Versace clothing is to look at the photo of the tags. It would normally say "Versace 32" not "Versace M". The actual tags attached to the clothes should spell "Versace Jeans Couture" - there are hundreds of Versace clothes on eBay, highly priced, with the tags "Versace Jeans Coutre" which is obviously spelt wrong and hence fake Versace.

Another handy tip is to look at the user selling the items, I have seen people selling fake Versace and keeping their feedback private, so nobody can read the comments buyers have left. That should give the impression that the seller would profit more money keeping the comments hidden from potential buyers.

Another tip is the price of the postage, generally you'd pay $10 postage, even from overseas, but the sellers who sell fake stuff want even more money so they over charge the postage starting from $20 plus compulsory insurace.

I hope this information is useful!