Hi Again! :)
Thesse clothes are from winx club season 4 the 'ski' outfits. They have not been shown in the প্রদর্শনী yet but there are some picture of them in Phoebe Faulkners "winx fairies" blog here is the link, just scroll down untill আপনি see it:
link thnx for reading, i hope i helped! :)