I would assume that everything in the Outlet store is lower quality than their standard retailer lines, across the board.

When you see a 'discounted' price that is so much lower, that's just marketing because they know the shopper cannot verify it. For example, there's no Camelia line in their standard retail offerings. None of the standard retail lines that places like Fine Linens sells are in their Outlet, and that's because they are entirely different products. If you google 'Frette Camelia', the only place you will see it for sale is on the Frette website plus one sketchy-looking site that claims to be a "personal shopper". Riight. A line through a "regular price" of $1300 doesn't mean that it ever actually sells for that much or is worth that much. It's a marketing gimmick.

Outlet-only products are usually outlet-quality, which means lower than what the manufacturer makes and ships to normal retailers. Lots of manufacturers do this, not only Frette and not only in bedding. Frette just makes things worse by not providing any details about the actual construction or fibers.

Also, simply saying "made in Italy" doesn't guarantee quality, or that no Portugese fabricator is as good or better. And does "made in" mean "milled in and sewn in [country]"? or just "sewn in" that country? Frette is very good at being very vague, lol

ETA: Not saying that the Frette Outlet items are 'bad', just that they are probably going to be lower quality than their standard retail lines are.