Outfit problem

I'm not sure if it's a bug or i do smth wrong but I have a problem with outfits. The ones I buy from vendors are fine - i see them in wardrobe and can use. But there are some outfits which where found in chests during the game or as a reward like the outfit for Solas side quest (about his past). I have all 6 wolf statues but the white outfit (my game is not in english so i'm not sure of its name) is still blocked. I bought everything from available vendors so what about the rest? About a half of my wardrobe is blocked so i guess it's not actually normal? Also some of the blocked outfits had this little 'diamond' like on the screenshot