capes and goblin mail
no. only capes can be dyed.
There are 21 saradimin items on RuneScape.
No.
No, you cannot make partyhats in RuneScape.
The best items in RuneScape are Partyhats, Divine and Elysian Spirit Shields, and Christmas Crackers Moneywise.
There is no way to clone items on Runescape, this was however a commonly used scam to get players to give them items to supposedly clone, but they don't get cloned.
While on RuneScape PVP worlds, if you die, you only lose the items you are carrying, not those in your bank, never in RuneScape will a death directly affect your banked items.
No. They do not.
There is no way to duplicate items in Runescape. Although there was a bug once which did allow a person to duplicate party hats, this was quickly fixed.
Only items obtained through quests.
No. You can lend items without being a member.
There are several items in RuneScape which have "sheet" in their name. Please clarify which one you mean.