It appears to be authentic and has "made in Italy" on the label.
"Made in Italy' does not mean what it used to. If any stage of the shirt's manufacture occurs in Italy then the tag is legal, even if nearly ever other part of the shirt was woven/cut/sewn/finished in some low-wage Eastern European joint. This has no necessary relation to the authenticity of the garment, of course.
Actually... this used to be true. Italy, having an economy that is in crises and losing alot of business to the Eastern Europeans has cracked down on clothing manufacturors and not allowed Italian Finished articles to show made in Italy. You want it to say made in Italy, Make it in Italy. I Know this for a fact with the kids lines and I suspect it with the Adult lines as well as I received a whole shipment of Cacharel for Women last season all made in Roumania a,d poland etc. despite the company and design coming from France.