How to spot a fake Zegna Suit:

Much like spotting fake cuban cigars, much of the detective work lies in the tag:...The real Zegna has extensions to the left of the "E" in Ermenehildo...the fake does not and is block or square looking...this picture is a real one. 

This picture shows a fake tag:  Note the block look of the "E"

All real Zegnas have "hand ticked" stitching on the lapels...and last but not least, use the old rule "if it seems to good to be true, it probably is a fake"...save your moneyand bid on something else.