All the Emanuel Ungaro items I've seen have been made by the Italian company Gruppo GFT - Gruppo Finanziario Tessile. Gruppo GFT is a HUGE company. They have produced lines under the labels of Joseph Abboud, Armani Le Collezioni, Mani, Valentino, Calvin Klein, Emanuel Ungaro, Claude Montana, Andrew Fezza, Louis Feraud, Profilo and others. I'm not absolutely certain how many of those licenses they still hold though. For instance the Mani and Le Collezioni lines are currently made in the Zegna factories. GFT has factories all over the world - in Italy, the US, Mexico and other countries. The only difference in quality between the different lines (and between garments produced in say, Italy vs Mexico) have to do with aesthetics and fabric. The actual construction methods are basically the same, which is to say largely machine-made and with a fused front. And I mean machines as in automated mass-production machinery, not simple sewing machines. It may be possible that the Saks main store orders Ungaro suits and specifies that they come from the Italian factories. However it is not the case that the "Made in Mexico" Ungaro suit you see at Off Fifth is necessarily of a lower quality. Here are two articles on Gruppo GFT: Factory in US Moda Online Profile
The Hugo Boss group was purchased in 1991 by the Italian company Marzotto. Marzotto produces both textiles and clothing and has factories all over the world - Italy, Germany, Switzerland, Czech Republic, Lithuania, the US, Tunisia, and Turkey according to the companies' website. In addition to Boss (which accounts for over 60% of their business) Marzotto also makes clothing under the labels of Ferre (Studio, GFF, Forma,) Missoni, Principe, and Marlboro. Again, I have seen no correlation between the quality of a Boss suits and the country it was made in. They are all about the same - mass produced and with a fused front (the exception being the Baldessarini line.) The main differences are the cut and fabric quality. You can find the Marzotto website here: Marzotto
Ermenegildo Zegna has factories all over the place too. Italy, Switzerland, Spain and possibly Portugal. The difference in quality is not dependant on where the garment was made but on which line it is. For instance the "Soft" line is machine made and has a fused front - which means it is inferior to the canvased Zegna suits. (The Mani and Le Collezioni lines are made in the same manner as the "Soft" suits.) There are a few differences between the different labels they use. They tend to use a slightly different label for some collections. The biggest difference is that they changed the way they stitched down the label a year or two back. The old label is stitched down like this:
While the new label is stitched down like this:
It's true that the merchandise in outlets is usually of an inferior quality. But so is a lot of the merchandise in the retail stores. It would be dangerous to assume that you are going to get a better product because you bought it in a Main-Store. It's better to educate yourself on how to tell the difference between a cheaply-made suit and a well-made one. Then you won't be tricked no matter where you buy.