Since there is no specific quest or hint about there being specific clothing items thats escpecially good for stealth i googled. ive tried to get the whole set of thief armour..But im lacking boots, hat and tunic.

internet says that the tunic is found in the Secret silvermint mine, and that its only available during the quest and after (not before) but ive done it and its boarded up now..is there another way in?

hat in goatskins hideout..but i only got a book there..and cant find anything in the barn where he hides.

cheers!