I have the following beginner forms on an alt I use to store forms (since the libraries hold such a small amount) that are now totally useless as they are attuned so can't be traded anymore. Am asking why?

Banner flag, Banner Staff
Bolster Dexterity Potion, Bolster Strength Potion
Cargo Cap, Cargo Sleeves, Cargo Wristband (all Cargo gear?)
Cloth Belt, Cloth Gloves, Cloth Mask (all Cloth gear?)
Dexterity Necklace, Dexterity Ring, Dexterity (all dex jewelry?)
Dexterity head Scale, Dexterity Wing Scale (all Dex Scales?)
Dragon Tool Claw
Cut Gem
Reinforced Round Shield