I like them both!
What about: "Made entirely and exclusively in Italy"? Too redundant?
GREAT, that's exactly what I hoped to hear. Yes, the product fits your description exactly, therefore I will definitely use both "entirely" and "exclusively".It just struck me... "entirely and exclusively" does not seem redundant to me if the product is referred to by name, has unique characterisitics and is made nowhere else. "XYZ stockings are made entirely and exclusively in Italy" makes sense to me in a business setting if this particular product has unique characteristics and is only made in Italy.
In this case I would be inclined to write:
Assembled in Italy using 100% Italian made components.
Since these are stockings, I don't think there are components or assembly involved, but I can see this being adapted as something like: "These stockings are manufactured in Italy using 100% Italian made material."