My advice for anyone looking to import clothing would be take a short trip to Bologna to the Centergross which is a big place where lots of wholesalers go
https://www.centergross.com/ or ask someone to check for you
https://www.sourcingitaly.com/, as it’s been said there’s a few designer outlets and fashion “districts” around but I don’t think it’s what the thread opener asked, my preferred designer outlets are in northern Italy in any case for that matter, I particularly love Serravalle Outlet
https://outlets.mcarthurglen.com/en/...et-serravalle/ which is another one part of the McArthur Glen group, it’s between Genoa and Turin as all the big names are there.
Around Parma the Fidenza Village is quite nice too
https://www.fidenzavillage.com/
But if it’s B2B you’re looking for I think Centergross would be the most obvious choice.
Centro Tessile Milano also but I think you need Italian VAT for that one not sure.